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Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 19

Re: Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 15

Re: Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 15

Ontario Respiratory Virus Bulletin, 2012-2013 (Week 15: April 7, 2013 ? April 13, 2013)

Summary of current and season-to-date respiratory virus activity in Ontario

? The proportion of respiratory samples testing positive for influenza is now at 7.6% (with influenza A at 1.9% and influenza B at 5.7%),* which is within the expected range based on the influenza positivity observed over the last four non-pandemic affected seasons.

o The majority of influenza cases this season (92.6%; 8,641/9,333) were influenza A (Table 1). The dominant circulating influenza A subtype is H3N2, representing 91.6% of all subtyped influenza A positive specimens.*

o In the season to date, 1,154 confirmed institutional respiratory infection outbreaks have been reported, 572 (49.6%) of which were laboratory confirmed as influenza A and 25 (2.2%) of which were laboratory confirmed as influenza B (Table 4).

o A total of 3,185 hospitalizations and 245 deaths have been reported among lab confirmed influenza cases in the current surveillance season to April 13 (Table 2). The majority of hospitalizations and deaths occurred in influenza A cases (93.7% and 96.3%, respectively).

? The cause of influenza-like-illness (ILI) activity in the 2012-2013 surveillance season is changing as the season progresses.

o At the beginning of the season, entero/rhinovirus was the causative organism identified in most institutional respiratory infection outbreaks. Subsequently, influenza A became the most common causative organism of institutional outbreaks (Table 4, Figure 5). Percent positivity results indicate that respiratory syncytial virus is currently the predominant circulating respiratory virus in Ontario (Table 3).*

o For the season to date, influenza A has had the highest percent positivity overall, followed by respiratory syncytial virus (Table 3).*

? Among all circulating respiratory viruses in week 15 (Table 3):

o Respiratory syncytial virus had the highest percent positivity (8.5%), which was lower compared to the previous week (13.2%).*

o Human metapneumovirus had the second highest percent positivity (7.4%), which was lower compared to the previous week (9.4%).*
...
[FONT=Calibri,Calibri][FONT=Calibri,Calibri]Update on human infections with [/FONT][/FONT]avian influenza A(H7N9) virus* [FONT=Calibri,Calibri][FONT=Calibri,Calibri]in China [/FONT][/FONT]​
[FONT=Calibri,Calibri][FONT=Calibri,Calibri]As of April 18, 2013 [/FONT][/FONT]

[FONT=Calibri,Calibri]
[FONT=Calibri,Calibri]On March 31, 2013, China announced the identification of three cases of human infection with avian influenza A virus A(H7N9). Prior to this event, there had been no previous reports of human infection with A(H7N9), although other A(H7) subtype infections causing human illness have been reported in Europe and North America, mainly in association with poultry outbreaks. [/FONT]

[FONT=Calibri,Calibri]As of April 18, 2013, the World Health Organization (WHO) has reported a total of 87 human cases of A(H7N9), including 17 deaths. Cases have been reported from four provinces: Anhui (3 cases), Henan (3 cases), Jiangsu (21 cases) and Zhejiang (27 cases); and two municipalities: Beijing (1 case) and Shanghai (32 cases). More than 1,000 close contacts of the confirmed cases are being closely monitored. [/FONT]

[FONT=Calibri,Calibri]Recent investigations have identified the virus in various poultry species including pigeons, chickens and ducks. Investigations are ongoing to determine potential reservoirs and modes of transmission as the source of infection remains unclear. According to the WHO, there is currently no evidence of sustained human-to-human transmission of A(H7N9). Until a source of infection is identified, it is likely that there will be further cases of human infection identified in previously unaffected areas of China. [/FONT]

[FONT=Calibri,Calibri]At this time, there have been no cases of A(H7N9) reported outside of China, although the Public Health Agency of Canada has issued a Level 2 Travel Health Notice for the situation (practice special precautions). Public Health Ontario Laboratories (PHOL) will be alerted of a possible case if a specimen is influenza-positive but un-subtypeable when tested by first line subtyping assays (seasonal A(H3N2) HA gene and A(H1N1)pdm09 NA gene), as is done with the current testing algorithm. According to current practice, any un-subtypeable influenza A-positive specimens are forwarded to the National Microbiology Laboratory for further investigation in parallel to PHOL conducting further testing. [/FONT]
[/FONT]
[FONT=Calibri,Calibri][FONT=Calibri,Calibri]This is the last weekly update of H7N9 in the Ontario Respiratory Virus Bulletin. For the latest updates and information, please refer to the resources below: [/FONT][/FONT]
[FONT=Calibri,Calibri][FONT=Calibri,Calibri]? [/FONT][/FONT]World Health Organization: [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Avian influenza situation updates [/FONT]
[/FONT][FONT=Calibri,Calibri][FONT=Calibri,Calibri]? [/FONT][/FONT]Public Health Agency of Canada: [FONT=Calibri,Calibri][FONT=Calibri,Calibri]H7N9 avian influenza [/FONT]
[FONT=Calibri,Calibri]? [/FONT][/FONT]Ministry of Health and Long-Term Care: [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Influenza A(H7N9) virus in China [/FONT]
[/FONT][FONT=Calibri,Calibri][FONT=Calibri,Calibri]? [/FONT][/FONT]Public Health Ontario: [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Hot Topics in Public Health [/FONT][/FONT]
[FONT=Calibri,Calibri][FONT=Calibri,Calibri]...[/FONT][/FONT]

Table 2. [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Hospitalizations and deaths among confirmed influenza cases by age group: Ontario, week 15 and cumulative (rates, and numbers in brackets) for the 2012-2013 season[/FONT][/FONT]



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


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


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


[/FONT]</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=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]<1 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (182) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]124.54 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (2) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.37 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1-4 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]8 (264) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]45.12 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.51 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5-14 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]2 (112) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]7.54 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (1) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.07 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]15-24 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (63) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]3.46 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.00 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]25-44 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]2 (219) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5.88 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (9) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.24 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]45-64 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]21 (505) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]13.29 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (27) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.71 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]65+ [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]32 (1,837) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]93.02 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (203) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]10.28 [/FONT][/FONT]


</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]Unknown [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]


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


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]67 (3,185) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]23.54 [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (245) [/FONT][/FONT]


</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.81 [/FONT][/FONT]


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

Full report:
http://www.oahpp.ca/resources/documents/ontario_respiratory_surveillance/Ontario%20Respiratory%20Virus%20Bulletin-Week%2015.pdf
 
Re: Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 16

Re: Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 16

Ontario Respiratory Virus Bulletin, 2012-2013 (Week 16: April 14, 2013 ? April 20, 2013)

Summary of current and season-to-date respiratory virus activity in Ontario

? Influenza activity has been relatively stable in recent weeks and is no longer the dominant circulating respiratory virus in Ontario, with the proportion of respiratory samples testing positive for all influenza virus types now at 7.5% (with influenza A at 1.1% and influenza B at 6.4%).*

o The majority of influenza cases this season (91.8%; 8,658/9,428) were influenza A (Table 1). The dominant circulating influenza A subtype is H3N2, representing 91.5% of all subtyped influenza A positive specimens.*

o In the season to date, 1,183 confirmed institutional respiratory infection outbreaks have been reported, 575 (48.6%) of which were laboratory confirmed as influenza A and 32 (2.7%) of which were laboratory confirmed as influenza B (Table 4).

o A total of 3,290 hospitalizations and 250 deaths have been reported among lab confirmed influenza cases in the current surveillance season to April 20 (Table 2). The majority of hospitalizations and deaths occurred in influenza A cases (93.1% and 96.4%, respectively).

? The cause of influenza-like-illness (ILI) activity in the 2012-2013 surveillance season is changing as the season progresses.

o At the beginning of the season, entero/rhinovirus was the causative organism identified in most institutional respiratory infection outbreaks. Subsequently, influenza A became the most common causative organism identified. The number of influenza A outbreaks has since declined and currently, a variety of causative organisms are being identified in institutional respiratory infection outbreaks, including influenza B (Table 4, Figure 5).

o For the season to date, influenza A has had the highest percent positivity overall, followed by respiratory syncytial virus (Table 3).*

? Among all circulating respiratory viruses in week 16 (Table 3):

o Human metapneumovirus had the highest percent positivity (6.5%), which was lower compared to the previous week (7.4%).*

o Influenza B had the second highest percent positivity (6.4%), which was higher compared to the previous week (5.7%).*
...

Table 2. [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Hospitalizations and deaths among confirmed influenza cases by age group: Ontario, week 16 and cumulative (rates, and numbers in brackets) for the 2012-2013 season [/FONT]
[/FONT]
<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=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]<1 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]4 (186) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]127.28 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (2) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.37 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1-4 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]13 (277) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]47.34 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.51 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5-14 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]11 (123) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]8.28 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (1) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.07 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]15-24 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (64) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]3.51 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.00 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]25-44 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]9 (228) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]6.13 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (9) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.24 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]45-64 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]20 (525) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]13.82 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (28) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.74 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]65+ [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]47 (1,884) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]95.40 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]4 (207) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]10.48 [/FONT][/FONT]

</TD></TR><TR><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]Unknown [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]

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

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]105 (3,290) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]24.31 [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5 (250) [/FONT][/FONT]

</TD><TD height=9 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.85 [/FONT][/FONT]

</TD></TR></TBODY></TABLE>
...
Full report:
http://www.oahpp.ca/resources/docum...ntario_Respiratory_Virus_Bulletin-Week_16.pdf
 
Re: Ontario Respiratory Virus Bulletin 2012-2013 - Surveillance Week 19

Ontario Respiratory Virus Bulletin, 2012-2013 (Week 19: May 5, 2013 ? May 11, 2013)

Summary of current and season-to-date respiratory virus activity in Ontario

 Influenza activity is lower, with the proportion of respiratory samples testing positive for all influenza virus types now at 5.8% (influenza A is at 1.2% and influenza B is at 4.6%).*

o The majority of influenza cases this season (90.1%; 8,725/9,679) were influenza A (Table 1). The dominant circulating influenza A subtype was H3N2, representing 91.0% of all subtyped influenza A positive specimens.*

o In the season to date, 1,243 confirmed institutional respiratory infection outbreaks have been reported, 580 (46.7%) of which were laboratory confirmed as influenza A and 39 (3.1%) of which were laboratory confirmed as influenza B (Table 4).

o A total of 3,464 hospitalizations and 261 deaths have been reported among lab confirmed influenza cases in the current surveillance season to May 11 (Table 2). The majority of hospitalizations and deaths occurred in influenza A cases (91.6% and 94.6%, respectively).

 The cause of influenza-like-illness (ILI) activity in the 2012-2013 surveillance season is changing as the season progresses.

o At the beginning of the season, entero/rhinovirus was the causative organism identified in most institutional respiratory infection outbreaks. Subsequently, influenza A became the most common causative organism identified. The number of influenza A outbreaks has since declined and in recent weeks, a variety of causative organisms have been identified in institutional respiratory infection outbreaks. (Table 4, Figure 5).

o For the season to date, influenza A has had the highest percent positivity overall, followed by respiratory syncytial virus (Table 3).*

 Among all other circulating respiratory viruses in week 19 (Table 3):

o Entero/rhinovirus had the highest percent positivity (10.7%), which was similar compared to the previous week (10.5%).*

o Parainfluenza had the second highest percent positivity (7.5%), which was slightly higher compared to the previous week (5.3%).*
...

Table 2. [FONT=Calibri,Calibri][FONT=Calibri,Calibri]Hospitalizations and deaths among confirmed influenza cases by age group: Ontario, week 19 and cumulative (rates, and numbers in brackets) for the 2012-2013 season [/FONT]
[/FONT]

<TABLE dir=ltr border=1 cellSpacing=0 cellPadding=7 width=535><TBODY><TR><TD height=15 vAlign=top width="20%">Age group

</TD><TD height=15 vAlign=top width="20%">Number of hospitalizations

</TD><TD height=15 vAlign=top width="20%">Cumulative rate per 100,000

</TD><TD height=15 vAlign=top width="20%">Number of
deaths

</TD><TD height=15 vAlign=top width="20%">Cumulative rate
per 100,000

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]<1 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (202) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]138.23 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (2) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.37 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1-4 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]4 (300) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]51.27 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.51 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5-14 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]2 (143) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]9.63 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (1) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.07 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]15-24 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (66) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]3.62 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.00 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]25-44 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (239) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]6.42 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (9) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.24 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]45-64 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]5 (552) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]14.53 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (30) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0.79 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]65+ [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]11 (1959) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]99.19 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (216) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]10.94 [/FONT][/FONT]

</TD></TR><TR><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]Unknown [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (3) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]0 (0) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]- [/FONT][/FONT]

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

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]23 (3464) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]25.60 [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1 (261) [/FONT][/FONT]

</TD><TD height=7 vAlign=top width="20%">[FONT=Calibri,Calibri][FONT=Calibri,Calibri]1.93 [/FONT][/FONT]

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

...

Full report:
http://osd.oahpp.ca/en/DataAndAnaly...o_Respiratory_Virus_Bulletin_Week_19_2013.pdf

Previous reports:
http://osd.oahpp.ca/en/ServicesAndT...Pages/Ontario-Respiratory-Virus-Bulletin.aspx
 
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