Ontario Influenza Bulletin 2011-2012 - Surveillance Season (September 1, 2011 ? September 1, 2012) - 1223 hospitalizations and 79 deaths total

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 9

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 9 (February 26, 2012 ? March 3, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 3, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

? Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 992 influenza cases have been reported for the 2011-2012 surveillance season to date, of which 306 were reported during week 9.

o The majority of influenza cases reported for the 2011-2012 season to date were subtyped as influenza A(H1N1)pdm09 (165 cases) or influenza B (607 cases), which together account for 77.8% (772/992) of cases this season.

o The majority of influenza cases this season have been children under 5 years old (279 cases) and adults 65 years of age and older (195 cases), which together account for 47.8% (474/992) of cases reported to date.

The highest number of cases (193) has occurred in the 1 to 4 year old age group, which represents 19.5% of cases.

o Among influenza cases that have been hospitalized, 33.7% (97/288) were children under 5 years old and 25.0% (72/288) were in adults over the age of 65 (Table 2).

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to March 3, 2012. While influenza A activity is the lowest it has been over five seasons, more influenza B activity is being observed this season compared to the 2010-2011 season.

? The cause(s) of ILI in Ontario from September 1, 2011 to March 3, 2012 has changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 181 influenza B isolates that have been characterized at the National Microbiology Laboratory, 102 (56.4%) are a different strain (B/Wisconsin/01/2010-like) and lineage and is not contained in this season?s trivalent influenza vaccine. The World Health Organization has recommended the inclusion of this strain in the vaccine for the 2012-2013 influenza season for the Northern Hemisphere.

o Since week 1, 31 institutional influenza outbreaks have been reported: 10 influenza A, 20 influenza B, and one combined A and B outbreak.

o RSV had the highest percent positivity among laboratory tests of respiratory samples during week 9 at 19.67% (Table 3). RSV also has had the highest percent positivity among isolates submitted for testing for the season to date at 13.83%.

o Coronavirus has had a percent positivity above 5% every week since week 52. For week 9, coronavirus had a percent positivity of 9.42%.
...

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 3, 2012)



<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=567><TBODY><TR><TD height=18 vAlign=top width="20%">Table 2.

Number of hospitalizations and deaths among influenza cases during week 9 and cumulative (in brackets) for the season by age group since September 1, 2011 Age Group

</TD><TD height=18 vAlign=top width="20%">Number of Hospitalizations




</TD><TD height=18 vAlign=top width="20%">Cumulative Rate per 100,000




</TD><TD height=18 vAlign=top width="20%">Number of Deaths




</TD><TD height=18 vAlign=top width="20%">Cumulative Rate per 100,000




</TD></TR><TR><TD height=9 vAlign=top width="20%"><1




</TD><TD height=9 vAlign=top width="20%">11 (32)




</TD><TD height=9 vAlign=top width="20%">22.60




</TD><TD height=9 vAlign=top width="20%">0 (0)




</TD><TD height=9 vAlign=top width="20%">0.00




</TD></TR><TR><TD height=9 vAlign=top width="20%">1-4




</TD><TD height=9 vAlign=top width="20%">19 (65)




</TD><TD height=9 vAlign=top width="20%">11.40




</TD><TD height=9 vAlign=top width="20%">0 (1)




</TD><TD height=9 vAlign=top width="20%">0.18




</TD></TR><TR><TD height=9 vAlign=top width="20%">5-14




</TD><TD height=9 vAlign=top width="20%">20 (46)




</TD><TD height=9 vAlign=top width="20%">3.08




</TD><TD height=9 vAlign=top width="20%">0 (0)




</TD><TD height=9 vAlign=top width="20%">0.00




</TD></TR><TR><TD height=9 vAlign=top width="20%">15-24




</TD><TD height=9 vAlign=top width="20%">2 (5)




</TD><TD height=9 vAlign=top width="20%">0.28




</TD><TD height=9 vAlign=top width="20%">0 (0)




</TD><TD height=9 vAlign=top width="20%">0.00




</TD></TR><TR><TD height=9 vAlign=top width="20%">25-44




</TD><TD height=9 vAlign=top width="20%">12 (31)




</TD><TD height=9 vAlign=top width="20%">0.84




</TD><TD height=9 vAlign=top width="20%">0 (0)




</TD><TD height=9 vAlign=top width="20%">0.00




</TD></TR><TR><TD height=9 vAlign=top width="20%">45-64




</TD><TD height=9 vAlign=top width="20%">13 (37)




</TD><TD height=9 vAlign=top width="20%">1.00




</TD><TD height=9 vAlign=top width="20%">0 (0)




</TD><TD height=9 vAlign=top width="20%">0.00




</TD></TR><TR><TD height=9 vAlign=top width="20%">65+




</TD><TD height=9 vAlign=top width="20%">26 (72)




</TD><TD height=9 vAlign=top width="20%">3.93




</TD><TD height=9 vAlign=top width="20%">0 (6)




</TD><TD height=9 vAlign=top width="20%">0.33




</TD></TR><TR><TD height=9 vAlign=top width="20%">Total




</TD><TD height=9 vAlign=top width="20%">103 (288)




</TD><TD height=9 vAlign=top width="20%">2.18




</TD><TD height=9 vAlign=top width="20%">0 (7)




</TD><TD height=9 vAlign=top width="20%">0.05




</TD></TR></TBODY></TABLE>

...

Full report:
http://www.oahpp.ca/resources/docume...n-Week%209.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 10

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 10 (March 4, 2012 ? March 10, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 10, 2012)

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 1432 influenza cases have been reported for the 2011-2012 surveillance season to date, of which 433 were reported during week 10.

o The majority of influenza cases reported for the 2011-2012 season to date were subtyped as influenza B, which accounts for 65.5% (938/1432) of cases this season.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to March 10, 2012. While influenza A activity is the lowest it has been over five seasons, more influenza B activity is being observed this season compared to the 2010-2011 season.

o Children under 5 years old (376 cases) and adults 65 years of age and older (294 cases) account for 46.8% (670/1432) of influenza cases reported to date. The highest number of cases (269) has occurred in the 1 to 4 year old age group, which represents 18.8% of cases.

o Among influenza cases that have been hospitalized, 33.0% (115/349) were children under 5 years old and 25.2% (88/349) were in adults over the age of 65 (Table 2).

o For the 2011-2012 season to date, 18 cases of influenza B with myositis (muscular inflammation causing severe pain in the legs) have been reported in iPHIS. Sixteen cases occurred between January 31, 2012 and March 10, 2012. Cases have been observed in six health units: Eastern Ontario (1), Halton Region (2), Peel Region (10), Simcoe-Muskoka (1), Toronto (3) and Wellington-Dufferin-Guelph (1)

o Of the 18 influenza B cases with myositis, 14 were reported as having been hospitalized. None of these cases reported that they had received the current season?s influenza vaccine.

 The cause(s) of ILI in Ontario from September 1, 2011 to March 10, 2012 has changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 218 influenza B isolates that have been characterized at the National Microbiology Laboratory, 126 (57.7%) are a different strain (B/Wisconsin/01/2010-like) and lineage from this season?s trivalent influenza vaccine. The World Health Organization has recommended the inclusion of this strain in the vaccine for the 2012-2013 influenza season for the Northern Hemisphere.

o Since week 1, 39 institutional influenza outbreaks have been reported: 10 influenza A, 28 influenza B, and one combined A and B outbreak.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2010.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 11

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 11 (March 11, 2012 ? March 17, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 17, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

? Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 1,942 influenza cases have been reported for the 2011-2012 surveillance season to date, of which 511 were reported during week 11.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounts for 69.6% (1352/1942) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 has been the dominant influenza A subtype

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to March 17, 2012. While influenza A activity is the lowest it has been over five seasons, influenza B activity is the highest it has been over five seasons.

o Children under 5 years old (489 cases) and adults 65 years of age and older (411 cases) account for 46.3% (900/1942) of influenza cases reported to date. The highest number of cases (365) has occurred in the 1 to 4 year old age group, which represents 18.8% of cases.

o Among influenza cases that have been hospitalized, 32.7% (139/425) were children under 5 years old and 24.7% (105/425) were adults over the age of 65 (Table 2).

o Since week 1, 56 institutional influenza outbreaks have been reported: 17 influenza A, 36 influenza B, and three combined A and B outbreaks.
o For the 2011-2012 season to date, 33 cases of influenza B with myositis (muscular inflammation causing severe pain in the legs) have been reported. Thirty-one cases occurred between January 31, 2012 and March 18, 2012. Cases have been observed in eleven health units: Chatham-Kent (1), Grey Bruce (1), Eastern Ontario (2), Hastings & Prince Edward Counties (2), Halton Region (4), Peel Region (13), Simcoe-Muskoka (4), Sudbury and District (1), Toronto (3), Wellington-Dufferin-Guelph (1) and York Region (1).

o Of the 33 influenza B cases with myositis, 23 were reported as having been hospitalized and no deaths among these cases were reported. One case reported receiving the current season?s influenza vaccine.

? The cause(s) of ILI in Ontario from September 1, 2011 to March 17, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 257 influenza B isolates characterized at the National Microbiology Laboratory, 144 (56.0%) are a different strain (B/Wisconsin/01/2010-like) and lineage from this season?s trivalent influenza vaccine. The World Health Organization has recommended the inclusion of this strain in the vaccine for the 2012-2013 influenza season for the Northern Hemisphere.

o Higher than expected ILI consultation rates for week 11 were driven by ILI in individuals less than 20 years of age.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2011.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 12

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 12 (March 18, 2012 ? March 24, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 24, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 2518 influenza cases have been reported for the 2011-2012 surveillance season to date, of which 562 were reported during week 12.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounts for 71.7% (1806/2518) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 has been the dominant influenza A subtype

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to March 24, 2012. While influenza A activity is the lowest it has been over five seasons, influenza B activity is the highest it has been over five seasons.

o Children under 5 years old (616 cases) and adults 65 years of age and older (538 cases) account for 45.8% (1154/2518) of influenza cases reported to date. The highest number of cases (460) has occurred in the 1 to 4 year old age group, which represents 18.3% of cases.

o Among influenza cases that have been hospitalized, 30.1% (156/519) were children under 5 years old and 25.2% (131/519) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1; since then, 69 have been reported: 18 influenza A, 48 influenza B, and three combined A and B outbreaks.

o For the 2011-2012 season to date, 52 cases of influenza B with myositis (muscular inflammation causing severe pain in the legs) have been reported. Forty-eight cases occurred between January 31, 2012 and March 17, 2012. Cases have been observed in 12 health units: Brant County (1), Chatham-Kent (1), Grey-Bruce (2), Eastern Ontario (2), Hastings & Prince Edward Counties (3), Halton Region (6), Niagara Region (1), Peel Region (26), Simcoe-Muskoka (4), Toronto (3), Wellington-Dufferin-Guelph (1) and York Region (2).

o Of the 52 influenza B cases with myositis, 34 were reported as having been hospitalized and no deaths among these cases were reported. Two cases reported receiving the current season?s influenza vaccine.

 The cause(s) of ILI in Ontario from September 1, 2011 to March 24, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 257 influenza B isolates characterized at the National Microbiology Laboratory, 144 (56.0%) are a different strain (B/Wisconsin/01/2010-like) and lineage from this season?s trivalent influenza vaccine.

o Higher than expected ILI consultation rates for week 12 were driven by ILI in individuals less than 20 years of age.

o Human metapneumovirus is now the dominant non-influenza respiratory virus.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2012.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 13

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 13 (March 25, 2012 ? March 31, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? March 31, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 2840 influenza cases have been reported for the 2011-2012 surveillance season to date, of which 314 were reported during week 13.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 72.3% (2054/2840) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to March 31, 2012. While influenza A activity is the lowest it has been over five seasons, influenza B activity is the highest it has been over five seasons.

o Children under 5 years old (685 cases) and adults 65 years of age and older (614 cases) account for 45.7% (1299/2840) of influenza cases reported to date. The highest number of cases (514) has occurred in the 1 to 4 year old age group, which represents 18.1% of cases.

o Among influenza cases that have been hospitalized, 29.6% (179/604) were children under 5 years old and 27.2% (164/604) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1; since then, 72 have been reported: 18 influenza A, 51 influenza B, and three combined A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to March 31, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 340 influenza B isolates characterized at the National Microbiology Laboratory, 206 (60.6%) are a different strain (B/Wisconsin/01/2010-like) and lineage from this season?s trivalent influenza vaccine. Influenza B positivity has declined in week 13 as compared to week 12.

o The higher than expected ILI consultation rate for week 12 was driven by ILI in individuals less than 20 years of age.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2013.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 14

Ontario Influenza Bulletin 2011-2012
SURVEILLANCE WEEK 14 (April 1, 2012 ? April 7, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? April 7, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 2973 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 72.6% (2159/2973) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to April 7, 2012. Influenza B activity has been decreasing since week 12 after reaching the highest activity level seen in over five seasons.

o Children under 5 years old (717 cases) and adults 65 years of age and older (644 cases) account for 45.8% (1361/2973) of influenza cases reported to date. The highest number of cases (537) has occurred in the 1 to 4 year old age group, which represents 18.1% of cases.

o Among influenza cases that have been hospitalized, 28.5% (193/678) were children under 5 years old and 28.8% (195/678) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1; since then, 81 have been reported: 18 influenza A, 60 influenza B, and three combined A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to April 7, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 340 influenza B isolates characterized at the National Microbiology Laboratory, 206 (60.6%) are a different strain (B/Wisconsin/01/2010-like) and lineage than the influenza B component of this season?s trivalent influenza vaccine.

o Coronavirus had the highest percent positivity among isolates submitted for testing in week 14 at 17.69%. This was a marked increase over a percent positivity of 5.43% and 5.19% in week 12 and week 13, respectively.

Full report:
http://www.oahpp.ca/resources/docume...-Week%2014.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 15

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 15 (April 8, 2012 ? April 14, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? April 14, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3244 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 73.0% (2369/3244) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to April 14, 2012. Influenza B activity has been decreasing since week 12 after reaching the highest activity level seen in over five seasons.

o Children under 5 years old (764 cases) and adults 65 years of age and older (718 cases) account for 45.7% (1482/3244) of influenza cases reported to date. The highest number of cases (573) occurred in the 1 to 4 year old age group, which represents 17.7% of cases.

o Among influenza cases that have been hospitalized, 26.3% (205/780) were children under 5 years old and 31.0% (242/780) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 93 have been reported: 20 outbreaks of influenza A, 68 outbreaks of influenza B, and five combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to April 14, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 360 influenza B isolates characterized at the National Microbiology Laboratory, 220 (61.1%) were a different strain (B/Wisconsin/01/2010-like) and lineage than the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for coronavirus dropped from 17.69% in week 14 to 6.97% in week 15. Coronavirus had the second highest percent positivity among specimens submitted for testing in week 15, with influenza B having the highest percent positivity at 11.58%.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2015.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 16

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 16 (April 15, 2012 ? April 21, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? April 21, 2012)
Produced by: Surveillance and Epidemiology, Public Health Ontario

Summary of current and season to date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3438 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 73.7% (2533/3438) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to April 21, 2012. In this season, influenza B activity reached the highest level of activity seen over five seasons. While influenza B activity has generally been in a downward trend since week 12, activity increased slightly in week 16.

o Children under 5 years old (792 cases) and adults 65 years of age and older (783 cases) account for 45.8% (1575/3438) of influenza cases reported to date. The highest number of cases (593) occurred in the 1 to 4 year old age group, which represents 17.2% of cases.

o Among influenza cases that have been hospitalized, 24.6% (217/883) were children under 5 years old and 33.4% (295/883) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 102 have been reported, including 23 outbreaks of influenza A, 76 outbreaks of influenza B, and three combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to April 21, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 392 influenza B isolates characterized at the National Microbiology Laboratory, 244 (62.2%) were of a strain (B/Wisconsin/01/2010-like) and lineage that is different from the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for coronavirus increased from 6.97% in week 15 to 11% in week 16. Coronavirus had the second highest percent positivity among specimens submitted for testing in week 16; influenza B had the highest percent positivity at 14.48%.
...

Table 2. Number of hospitalizations and deaths among influenza cases during week 16 and cumulative (in brackets) for the season by age group since September 1, 2011

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=550><TBODY><TR><TD height=16 vAlign=top width="20%">Age Group


</TD><TD height=16 vAlign=top width="20%">Number of Hospitalizations


</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000


</TD><TD height=16 vAlign=top width="20%">Number of Deaths


</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000


</TD></TR><TR><TD height=7 vAlign=top width="20%"><1


</TD><TD height=7 vAlign=top width="20%">3 (69)


</TD><TD height=7 vAlign=top width="20%">48.73


</TD><TD height=7 vAlign=top width="20%">0 (1)


</TD><TD height=7 vAlign=top width="20%">0.71


</TD></TR><TR><TD height=7 vAlign=top width="20%">1-4


</TD><TD height=7 vAlign=top width="20%">9 (148)


</TD><TD height=7 vAlign=top width="20%">25.96


</TD><TD height=7 vAlign=top width="20%">0 (1)


</TD><TD height=7 vAlign=top width="20%">0.18


</TD></TR><TR><TD height=7 vAlign=top width="20%">5-14


</TD><TD height=7 vAlign=top width="20%">11 (127)


</TD><TD height=7 vAlign=top width="20%">8.50


</TD><TD height=7 vAlign=top width="20%">0 (1)


</TD><TD height=7 vAlign=top width="20%">0.07


</TD></TR><TR><TD height=7 vAlign=top width="20%">15-24


</TD><TD height=7 vAlign=top width="20%">1 (16)


</TD><TD height=7 vAlign=top width="20%">0.89


</TD><TD height=7 vAlign=top width="20%">0 (0)


</TD><TD height=7 vAlign=top width="20%">0.00


</TD></TR><TR><TD height=7 vAlign=top width="20%">25-44


</TD><TD height=7 vAlign=top width="20%">5 (79)


</TD><TD height=7 vAlign=top width="20%">2.15


</TD><TD height=7 vAlign=top width="20%">0 (1)


</TD><TD height=7 vAlign=top width="20%">0.03


</TD></TR><TR><TD height=7 vAlign=top width="20%">45-64


</TD><TD height=7 vAlign=top width="20%">21 (148)


</TD><TD height=7 vAlign=top width="20%">4.01


</TD><TD height=7 vAlign=top width="20%">0 (9)


</TD><TD height=7 vAlign=top width="20%">0.24


</TD></TR><TR><TD height=7 vAlign=top width="20%">65+


</TD><TD height=7 vAlign=top width="20%">53 (295)


</TD><TD height=7 vAlign=top width="20%">16.09


</TD><TD height=7 vAlign=top width="20%">5 (45)


</TD><TD height=7 vAlign=top width="20%">2.45


</TD></TR><TR><TD height=7 vAlign=top width="20%">Total


</TD><TD height=7 vAlign=top width="20%">103 (883*)


</TD><TD height=7 vAlign=top width="20%">6.68


</TD><TD height=7 vAlign=top width="20%">5 (58)


</TD><TD height=7 vAlign=top width="20%">0.44


</TD></TR></TBODY></TABLE>
...
Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2016.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 17

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 17 (April 22, 2012 ? April 28, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? April 28, 2012)
Produced by: Surveillance Services, Public Health Ontario

Summary of current and season- to- date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3555 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 74.0% (2630/3555) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to April 28, 2012. This season, influenza B activity reached the highest level of activity seen in over five seasons. Since week 12, influenza B activity has generally been decreasing.

o For the 3551 cases for which age is known, children under 5 years old (811 cases) and adults 65 years of age and older (828 cases) account for 46.2% (1639/3551) of influenza cases reported to date. The highest number of cases (605) occurred in the 1 to 4 year old age group, which represents 17.0% of cases.

o Among influenza cases that have been hospitalized, 24.5% (228/930) were children under 5 years old and 33.7% (313/930) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 114 have been reported, including 24 outbreaks of influenza A, 87 outbreaks of influenza B, and three combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to April 28, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 412 influenza B isolates characterized at the National Microbiology Laboratory, 261 (63.3%) were of a strain (B/Wisconsin/01/2010-like) and lineage that is different from the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for human metapneumovirus increased from 6.7% in week 16 to 8.1% in week 17. Human metapneumovirus had the second highest percent positivity among specimens submitted for testing in week 17; influenza B had the highest percent positivity at 11.7%.
...

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=550><TBODY><TR><TD height=16 vAlign=top width="20%">Age Group

</TD><TD height=16 vAlign=top width="20%">Number of Hospitalizations

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD><TD height=16 vAlign=top width="20%">Number of Deaths

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD></TR><TR><TD height=7 vAlign=top width="20%"><1

</TD><TD height=7 vAlign=top width="20%">4 (73)

</TD><TD height=7 vAlign=top width="20%">51.56

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.71

</TD></TR><TR><TD height=7 vAlign=top width="20%">1-4

</TD><TD height=7 vAlign=top width="20%">7 (155)

</TD><TD height=7 vAlign=top width="20%">27.19

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.18

</TD></TR><TR><TD height=7 vAlign=top width="20%">5-14

</TD><TD height=7 vAlign=top width="20%">4 (131)

</TD><TD height=7 vAlign=top width="20%">8.77

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.07

</TD></TR><TR><TD height=7 vAlign=top width="20%">15-24

</TD><TD height=7 vAlign=top width="20%">1 (17)

</TD><TD height=7 vAlign=top width="20%">0.94

</TD><TD height=7 vAlign=top width="20%">0 (0)

</TD><TD height=7 vAlign=top width="20%">0.00

</TD></TR><TR><TD height=7 vAlign=top width="20%">25-44

</TD><TD height=7 vAlign=top width="20%">6 (85)

</TD><TD height=7 vAlign=top width="20%">2.31

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.03

</TD></TR><TR><TD height=7 vAlign=top width="20%">45-64

</TD><TD height=7 vAlign=top width="20%">7 (155)

</TD><TD height=7 vAlign=top width="20%">4.20

</TD><TD height=7 vAlign=top width="20%">0 (9)

</TD><TD height=7 vAlign=top width="20%">0.24

</TD></TR><TR><TD height=7 vAlign=top width="20%">65+

</TD><TD height=7 vAlign=top width="20%">18 (313)

</TD><TD height=7 vAlign=top width="20%">17.07

</TD><TD height=7 vAlign=top width="20%">0 (45)

</TD><TD height=7 vAlign=top width="20%">2.45

</TD></TR><TR><TD height=7 vAlign=top width="20%">Total

</TD><TD height=7 vAlign=top width="20%">47 (930*)

</TD><TD height=7 vAlign=top width="20%">7.04

</TD><TD height=7 vAlign=top width="20%">1 (59*)

</TD><TD height=7 vAlign=top width="20%">0.45

</TD></TR></TBODY></TABLE>

...
Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2017.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 18

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 18 (April 29, 2012 ? May 5, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? May 5, 2012)
Produced by: Surveillance Services, Public Health Ontario

Summary of current and season- to- date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3692 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 74.3% (2745/3692) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to May 5, 2012. This season, influenza B activity reached the highest level of activity seen in over five seasons. Since week 12, influenza B activity has generally been decreasing.

o For the 3687 cases for which age is known, children under 5 years old (833 cases) and adults 65 years of age and older (876 cases) account for 46.4% (1709/3687) of influenza cases reported to date. The highest number of cases (617) occurred in the 1 to 4 year old age group, which represents 16.7% of cases.

o Among influenza cases that have been hospitalized, 24.8% (253/1020) were children under 5 years old and 34.1% (348/1020) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 119 have been reported, including 25 outbreaks of influenza A, 91 outbreaks of influenza B, and three combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to May 5, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 508 influenza B isolates characterized at the National Microbiology Laboratory, 326 (64.2%) were of a strain (B/Wisconsin/01/2010-like) and lineage that is different from the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for human metapneumovirus increased from 8.1% in week 17 to 9.1% in week 18. Human metapneumovirus had the second highest percent positivity among specimens submitted for testing in week 18; influenza B had the highest percent positivity at 13.5%.
...

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=550><TBODY><TR><TD height=16 vAlign=top width="20%">Age Group

</TD><TD height=16 vAlign=top width="20%">Number of Hospitalizations

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD><TD height=16 vAlign=top width="20%">Number of Deaths

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD></TR><TR><TD height=7 vAlign=top width="20%"><1

</TD><TD height=7 vAlign=top width="20%">8 (81)

</TD><TD height=7 vAlign=top width="20%">57.21

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.71

</TD></TR><TR><TD height=7 vAlign=top width="20%">1-4

</TD><TD height=7 vAlign=top width="20%">17 (172)

</TD><TD height=7 vAlign=top width="20%">30.17

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.18

</TD></TR><TR><TD height=7 vAlign=top width="20%">5-14

</TD><TD height=7 vAlign=top width="20%">9 (140)

</TD><TD height=7 vAlign=top width="20%">9.37

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.07

</TD></TR><TR><TD height=7 vAlign=top width="20%">15-24

</TD><TD height=7 vAlign=top width="20%">0 (17)

</TD><TD height=7 vAlign=top width="20%">0.94

</TD><TD height=7 vAlign=top width="20%">0 (0)

</TD><TD height=7 vAlign=top width="20%">0.00

</TD></TR><TR><TD height=7 vAlign=top width="20%">25-44

</TD><TD height=7 vAlign=top width="20%">9 (94)

</TD><TD height=7 vAlign=top width="20%">2.56

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.03

</TD></TR><TR><TD height=7 vAlign=top width="20%">45-64

</TD><TD height=7 vAlign=top width="20%">12 (167)

</TD><TD height=7 vAlign=top width="20%">4.53

</TD><TD height=7 vAlign=top width="20%">0 (9)

</TD><TD height=7 vAlign=top width="20%">0.24

</TD></TR><TR><TD height=7 vAlign=top width="20%">65+

</TD><TD height=7 vAlign=top width="20%">35 (348)

</TD><TD height=7 vAlign=top width="20%">18.98

</TD><TD height=7 vAlign=top width="20%">3 (48)

</TD><TD height=7 vAlign=top width="20%">2.62

</TD></TR><TR><TD height=7 vAlign=top width="20%">Total

</TD><TD height=7 vAlign=top width="20%">90 (1020*)

</TD><TD height=7 vAlign=top width="20%">7.72

</TD><TD height=7 vAlign=top width="20%">3 (62*)

</TD><TD height=7 vAlign=top width="20%">0.47

</TD></TR></TBODY></TABLE>
...

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2018.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 19

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 19 (May 6, 2012 ? May 12, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? May 12, 2012)
Produced by: Surveillance Services, Public Health Ontario

Summary of current and season- to- date influenza activity

 Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3778 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 74.6% (2820/3778) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to May 12, 2012. This season, influenza B activity reached the highest level of activity seen in over five seasons. Influenza B activity has been decreasing since week 12.

o For the 3769 cases for which age is known, children under 5 years old (844 cases) and adults 65 years of age and older (907 cases) account for 46.5% (1751/3769) of influenza cases reported to date. The highest number of cases (625) occurred in the 1 to 4 year old age group, which represents 16.6% of cases.

o Among influenza cases that have been hospitalized, 24.7% (268/1086) were children under 5 years old and 34.7% (377/1086) were adults over the age of 65 (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 124 have been reported, including 25 outbreaks of influenza A, 96 outbreaks of influenza B, and three combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to May 12, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus. Of the 531 influenza B isolates characterized at the National Microbiology Laboratory, 338 (63.7%) were of a strain (B/Wisconsin/01/2010-like) and lineage that is different from the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for human metapneumovirus decreased from 9.1% in week 18 to 7.0% in week 19. Human metapneumovirus had the second highest percent positivity among specimens submitted for testing in week 19; influenza B had the highest percent positivity at 8.7%.
...

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=550><TBODY><TR><TD height=16 vAlign=top width="20%">Age Group

</TD><TD height=16 vAlign=top width="20%">Number of Hospitalizations

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD><TD height=16 vAlign=top width="20%">Number of Deaths

</TD><TD height=16 vAlign=top width="20%">Cumulative Rate per 100,000

</TD></TR><TR><TD height=7 vAlign=top width="20%"><1

</TD><TD height=7 vAlign=top width="20%">7 (88)

</TD><TD height=7 vAlign=top width="20%">62.15

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.71

</TD></TR><TR><TD height=7 vAlign=top width="20%">1-4

</TD><TD height=7 vAlign=top width="20%">8 (180)

</TD><TD height=7 vAlign=top width="20%">31.58

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.18

</TD></TR><TR><TD height=7 vAlign=top width="20%">5-14

</TD><TD height=7 vAlign=top width="20%">6 (146)

</TD><TD height=7 vAlign=top width="20%">9.77

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.07

</TD></TR><TR><TD height=7 vAlign=top width="20%">15-24

</TD><TD height=7 vAlign=top width="20%">1 (18)

</TD><TD height=7 vAlign=top width="20%">1.00

</TD><TD height=7 vAlign=top width="20%">0 (0)

</TD><TD height=7 vAlign=top width="20%">0.00

</TD></TR><TR><TD height=7 vAlign=top width="20%">25-44

</TD><TD height=7 vAlign=top width="20%">3 (97)

</TD><TD height=7 vAlign=top width="20%">2.64

</TD><TD height=7 vAlign=top width="20%">0 (1)

</TD><TD height=7 vAlign=top width="20%">0.03

</TD></TR><TR><TD height=7 vAlign=top width="20%">45-64

</TD><TD height=7 vAlign=top width="20%">12 (179)

</TD><TD height=7 vAlign=top width="20%">4.85

</TD><TD height=7 vAlign=top width="20%">0 (9)

</TD><TD height=7 vAlign=top width="20%">0.24

</TD></TR><TR><TD height=7 vAlign=top width="20%">65+

</TD><TD height=7 vAlign=top width="20%">29 (377)

</TD><TD height=7 vAlign=top width="20%">20.56

</TD><TD height=7 vAlign=top width="20%">4 (52)

</TD><TD height=7 vAlign=top width="20%">2.84

</TD></TR><TR><TD height=7 vAlign=top width="20%">Total

</TD><TD height=7 vAlign=top width="20%">66 (1086*)

</TD><TD height=7 vAlign=top width="20%">8.22

</TD><TD height=7 vAlign=top width="20%">4 (66*)

</TD><TD height=7 vAlign=top width="20%">0.50

</TD></TR></TBODY></TABLE>

...
Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2019.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 20

Ontario Influenza Bulletin I 2011-2012
SURVEILLANCE WEEK 20 (May 13, 2012 ? May 19, 2012)

Ontario Influenza Bulletin, 2011-2012 (September 1, 2011 ? May 19, 2012)
Produced by: Surveillance Services, Public Health Ontario

Summary of current and season- to- date influenza activity

? Year-to-date overall influenza activity for the 2011-2012 season has been lower than the same period in previous years:

o A total of 3836 influenza cases have been reported for the 2011-2012 surveillance season to date.

o The majority of influenza cases reported for the 2011-2012 season to date were influenza B, which accounted for 74.7% (2864/3836) of cases this season. While influenza B is the dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010-2011 season, fewer influenza cases and outbreaks have been reported this season from September 1, 2011 to May 19, 2012. This season, influenza B activity reached the highest level of activity seen in over five seasons. Influenza B activity has been decreasing since week 12.

o For the 3826 cases for which age is known, children under 5 years old (851 cases) and adults 65 years of age and older (932 cases) account for 46.6% (1783/3826) of influenza cases reported to date. The highest number of cases (631) occurred in the 1 to 4 year old age group, which represents 16.5% of cases.

o Among influenza cases that have been hospitalized, 24.9% (279/1122) were children under 5 years old and 34.5% (387/1122) were adults over the age of 65 years (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 127 have been reported, including 26 outbreaks of influenza A, 98 outbreaks of influenza B, and three combined influenza A and B outbreaks.

? The cause(s) of ILI in Ontario from September 1, 2011 to May 19, 2012 changed as the season progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus although the incidence has been decreasing since week 12. Of the 548 influenza B isolates characterized at the National Microbiology Laboratory, 350 (63.9%) were of a strain (B/Wisconsin/01/2010-like) and lineage that is different from the influenza B component of this season?s trivalent influenza vaccine.

o The percent positivity for parainfluenza virus increased from 1.6% in week 19 to 3.6% in week 20. Parainfluenza virus had the second highest percent positivity among specimens submitted for testing in week 20; entero/rhinovirus had the highest percent positivity at 5.2%.
...

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=567><TBODY><TR><TD height=18 vAlign=top width="20%">Age Group



</TD><TD height=18 vAlign=top width="20%">Number of Hospitalizations



</TD><TD height=18 vAlign=top width="20%">Cumulative Rate per 100,000



</TD><TD height=18 vAlign=top width="20%">Number of Deaths



</TD><TD height=18 vAlign=top width="20%">Cumulative Rate per 100,000



</TD></TR><TR><TD height=9 vAlign=top width="20%"><1



</TD><TD height=9 vAlign=top width="20%">6 (94)



</TD><TD height=9 vAlign=top width="20%">66.39



</TD><TD height=9 vAlign=top width="20%">0 (1)



</TD><TD height=9 vAlign=top width="20%">0.71



</TD></TR><TR><TD height=9 vAlign=top width="20%">1-4



</TD><TD height=9 vAlign=top width="20%">5 (185)



</TD><TD height=9 vAlign=top width="20%">32.45



</TD><TD height=9 vAlign=top width="20%">0 (1)



</TD><TD height=9 vAlign=top width="20%">0.18



</TD></TR><TR><TD height=9 vAlign=top width="20%">5-14



</TD><TD height=9 vAlign=top width="20%">6 (152)



</TD><TD height=9 vAlign=top width="20%">10.17



</TD><TD height=9 vAlign=top width="20%">0 (1)



</TD><TD height=9 vAlign=top width="20%">0.07



</TD></TR><TR><TD height=9 vAlign=top width="20%">15-24



</TD><TD height=9 vAlign=top width="20%">1 (19)



</TD><TD height=9 vAlign=top width="20%">1.05



</TD><TD height=9 vAlign=top width="20%">0 (0)



</TD><TD height=9 vAlign=top width="20%">0.00



</TD></TR><TR><TD height=9 vAlign=top width="20%">25-44



</TD><TD height=9 vAlign=top width="20%">0 (97)



</TD><TD height=9 vAlign=top width="20%">2.64



</TD><TD height=9 vAlign=top width="20%">0 (1)



</TD><TD height=9 vAlign=top width="20%">0.03



</TD></TR><TR><TD height=9 vAlign=top width="20%">45-64



</TD><TD height=9 vAlign=top width="20%">8 (187)



</TD><TD height=9 vAlign=top width="20%">5.07



</TD><TD height=9 vAlign=top width="20%">0 (9)



</TD><TD height=9 vAlign=top width="20%">0.24



</TD></TR><TR><TD height=9 vAlign=top width="20%">65+



</TD><TD height=9 vAlign=top width="20%">10 (387)



</TD><TD height=9 vAlign=top width="20%">21.10



</TD><TD height=9 vAlign=top width="20%">2 (54)



</TD><TD height=9 vAlign=top width="20%">2.94



</TD></TR><TR><TD height=9 vAlign=top width="20%">Total



</TD><TD height=9 vAlign=top width="20%">36 (1122*)



</TD><TD height=9 vAlign=top width="20%">8.49



</TD><TD height=9 vAlign=top width="20%">2 (68*)



</TD><TD height=9 vAlign=top width="20%">0.51



</TD></TR></TBODY></TABLE>

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2020.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 21

Ontario Influenza Bulletin I 2011‐2012
SURVEILLANCE WEEK 21 (May 20, 2012 ? May 26, 2012)
...

Please note that beginning with week 22, Public Health Ontario will be publishing activity level reports and abbreviated versions of the Ontario Influenza Bulletin on alternating weeks. Full weekly versions of the Ontario Influenza Bulletin will resume in November 2012.

Ontario Influenza Bulletin, 2011‐2012 (September 1, 2011 ? May 26, 2012)
Produced by: Surveillance Services, Public Health Ontario

Summary of current and season‐ to‐ date influenza activity

 Year‐to‐date overall influenza activity for the 2011‐2012 season has been lower than the same
period in previous years:

o A total of 3877 influenza cases have been reported for the 2011‐2012 surveillance season to
date.

o The majority of influenza cases reported for the 2011‐2012 season to date were influenza B,
which accounted for 74.8% (2900/3877) of cases this season. While influenza B is the
dominant influenza type, A(H1N1)pdm09 is the dominant influenza A subtype.

o Compared to the same period in the 2010‐2011 season, fewer influenza cases and
outbreaks have been reported this season from September 1, 2011 to May 26, 2012. This
season, influenza B activity reached the highest level of activity seen in over five seasons.
Influenza B activity has been decreasing since week 12.

o For the 3867 cases for which age is known, children under 5 years old (858 cases) and adults
65 years of age and older (949 cases) account for 46.7% (1807/3867) of influenza cases
reported to date. The highest number of cases (636) occurred in the 1 to 4 year old age
group, which represents 16.4% of cases.

o Among influenza cases that have been hospitalized, 24.9% (286/1149) were children under
5 years old and 34.6% (398/1149) were adults over the age of 65 years (Table 2).

o No institutional influenza outbreaks were reported prior to week 1 of 2012; since then, 133
have been reported, including 27 outbreaks of influenza A, 103 outbreaks of influenza B,
and three combined influenza A and B outbreaks.

 The cause(s) of ILI in Ontario from September 1, 2011 to May 26, 2012 changed as the season
progressed:

o Since week 5, influenza B has been the dominant circulating influenza virus although the
incidence has been decreasing since week 12. Of the 558 influenza B isolates characterized
at the National Microbiology Laboratory, 356 (63.8%) were of a strain
(B/Wisconsin/01/2010‐like) and lineage that is different from the influenza B component of
this season?s trivalent influenza vaccine.

o The percent positivity for parainfluenza virus decreased from 3.6% in week 20 to 2.9% in
week 21. Parainfluenza virus had the second highest percent positivity among specimens
submitted for testing in week 21; entero/rhinovirus had the highest percent positivity at
15.3%.
...


Full report:
http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Week%2021.pdf

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Week 21

Ontario Influenza Bulletin, 2011-2012 (June 10, 2011 ? June 23, 2012)

Produced by: Surveillance Services, Public Health Ontario

Highlights of current respiratory virus activity for weeks 24 and 25 compared to weeks 22 and 23

Entero/rhinovirus had the highest percent positivity for weeks 24 and 25 at 7.80%. Parainfluenza virus had the second highest percent positivity among specimens submitted for testing in weeks 24 and 25. Percent positivity for parainfluenza virus increased from 5.08% in weeks 22 and 23 to 5.75% in weeks 24 and 25.

In weeks 24 and 25, a total of 7 new insitutional respiratory infection outbreaks were reported, including 3 outbreaks of entero/rhinovirus, 1 outbreak of parainfluenza and 3 outbreaks with no organism identified or reported. For the 2011-2012 season to date, 644 institutional respiratory infection outbreaks have been reported, including 138 outbreaks of influenza A and B.
<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=614><TBODY><TR><TD height=30 vAlign=top width="33%" colSpan=5>Table 1. Number of respiratory specimens tested by all methods for influenza and other respiratory viruses and percent positivity, Ontario: Weeks 24 and 25 Detected viruses

</TD><TD height=30 vAlign=top width="33%" colSpan=5>Number and percent positive specimens

</TD><TD height=30 vAlign=top width="33%" colSpan=4>Total number of specimens tested

</TD></TR><TR><TD height=16 vAlign=top width="17%" colSpan=2>Week 24
n (%)

</TD><TD height=16 vAlign=top width="17%" colSpan=2>Week 25
n (%)

</TD><TD height=16 vAlign=top width="17%" colSpan=3>Cumulative
n (%)

</TD><TD height=16 vAlign=top width="17%" colSpan=2>Week 24
n

</TD><TD height=16 vAlign=top width="17%" colSpan=3>Week 25
n

</TD><TD height=16 vAlign=top width="17%" colSpan=2>Cumulative
n

</TD></TR><TR><TD height=6 vAlign=top width="14%">Influenza A (all)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>1 (0.33)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>2 (0.84)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>953 (2.43)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>302

</TD><TD height=6 vAlign=top width="14%" colSpan=2>238

</TD><TD height=6 vAlign=top width="14%">39220

</TD></TR><TR><TD height=6 vAlign=top width="14%">Influenza B

</TD><TD height=6 vAlign=top width="14%" colSpan=2>4 (1.32)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>1 (0.42)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>2758 (7.03)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>302

</TD><TD height=6 vAlign=top width="14%" colSpan=2>238

</TD><TD height=6 vAlign=top width="14%">39220

</TD></TR><TR><TD height=6 vAlign=top width="14%">Parainfluenza virus

</TD><TD height=6 vAlign=top width="14%" colSpan=2>15 (5.7)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>13 (5.8)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>801 (2.43)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>263

</TD><TD height=6 vAlign=top width="14%" colSpan=2>224

</TD><TD height=6 vAlign=top width="14%">33007

</TD></TR><TR><TD height=6 vAlign=top width="14%">Adenovirus

</TD><TD height=6 vAlign=top width="14%" colSpan=2>3 (1.14)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>2 (0.89)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>488 (1.48)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>263

</TD><TD height=6 vAlign=top width="14%" colSpan=2>224

</TD><TD height=6 vAlign=top width="14%">32982

</TD></TR><TR><TD height=14 vAlign=top width="14%">Respiratory syncytial virus

</TD><TD height=14 vAlign=top width="14%" colSpan=2>2 (0.75)

</TD><TD height=14 vAlign=top width="14%" colSpan=3>1 (0.44)

</TD><TD height=14 vAlign=top width="14%" colSpan=2>3477 (10.39)

</TD><TD height=14 vAlign=top width="14%" colSpan=3>266

</TD><TD height=14 vAlign=top width="14%" colSpan=2>227

</TD><TD height=14 vAlign=top width="14%">33466

</TD></TR><TR><TD height=6 vAlign=top width="14%">Entero/rhinovirus

</TD><TD height=6 vAlign=top width="14%" colSpan=2>18 (6.84)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>20 (8.93)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>1335 (4.6)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>263

</TD><TD height=6 vAlign=top width="14%" colSpan=2>224

</TD><TD height=6 vAlign=top width="14%">29017

</TD></TR><TR><TD height=14 vAlign=top width="14%">Human metapneumovirus

</TD><TD height=14 vAlign=top width="14%" colSpan=2>5 (7.25)

</TD><TD height=14 vAlign=top width="14%" colSpan=3>3 (3.9)

</TD><TD height=14 vAlign=top width="14%" colSpan=2>488 (3.33)

</TD><TD height=14 vAlign=top width="14%" colSpan=3>69

</TD><TD height=14 vAlign=top width="14%" colSpan=2>77

</TD><TD height=14 vAlign=top width="14%">14672

</TD></TR><TR><TD height=6 vAlign=top width="14%">Coronavirus

</TD><TD height=6 vAlign=top width="14%" colSpan=2>2 (2.9)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>1 (1.3)

</TD><TD height=6 vAlign=top width="14%" colSpan=2>478 (4.51)

</TD><TD height=6 vAlign=top width="14%" colSpan=3>69

</TD><TD height=6 vAlign=top width="14%" colSpan=2>77

</TD><TD height=6 vAlign=top width="14%">10606

</TD></TR></TBODY></TABLE>

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Weeks24_25.pdf

Previous reports:

http://www.oahpp.ca/resources/flubulletin.html

[Pathfinder]

Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Weeks 28-29

Ontario Influenza Bulletin, 2011‐2012 (July 8, 2012 ? July 21, 2012)
Produced by: Surveillance Services, Public Health Ontario

Highlights of current respiratory virus activity for weeks 28 and 29 compared to weeks 26 and 27

 Entero/rhinovirus had the highest percent positivity for weeks 28 and 29 at 12.36% (Table 1).
Parainfluenza virus had the second highest percent positivity among specimens submitted for
testing in weeks 28 and 29. Percent positivity for parainfluenza virus decreased from 7.74% in weeks
26 and 27 to 6.63% in weeks 28 and 29.

 In weeks 28 and 29, a total of nine new insitutional respiratory infection outbreaks were reported,
including one outbreak of influenza A and eight outbreaks with no organisms reported (Figure 1).
For the 2011‐2012 season to date, 677 institutional respiratory infection outbreaks have been
reported, including 139 influenza A or B outbreaks.

 While an increase in the provincial ILI sentinel consultation rate occurred from week 28 to 29,
this variability may be due to the low number of sentinels reporting.

The current season?s rates for both weeks 28 and 29 are similar to the historical average (Figure 3).

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Weeks%2028_29.pdf

----------------------------------------------------------------------------------------------------------------------------------------------
?Influenza Activity Map: Week 30

Localized Windsor-Essex County (WEC)

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Activity%20Map-Week%2030-12.pdf