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

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Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Weeks 30-31

Ontario Influenza Bulletin, 2011

‐2012 (July 22, 2012 ? August 4, 2012)

Produced by: Surveillance Services, Public Health Ontario

Highlights of current respiratory virus activity for weeks 30 and 31 compared to weeks 28 and 29

Entero/rhinovirus had the highest percent positivity for weeks 30 and 31 at 10.22% (Table 1). Parainfluenza virus had the second highest percent positivity among specimens submitted for testing in weeks 30 and 31. Percent positivity for parainfluenza virus was similar for weeks 30 and 31 at 6.96% as for weeks 28 and 29 at 6.63%.


In weeks 30 and 31, a total of twelve new insitutional respiratory infection outbreaks were reported, including one outbreak of influenza A, four outbreaks of entero/rhinovirus and seven outbreaks with no organisms reported (Figure 1). For the 2011‐2012 season to date, 696 institutional respiratory infection outbreaks have been reported, including 140 influenza A or B outbreaks.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Weeks%2030_31%20FOR%20APPROVAL.pdf

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Re: Ontario Influenza Bulletin 2011-2012 - Surveillance Weeks 30-31

Influenza Activity Map: Week 32

Localized - WEC Windsor-Essex County

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Activity%20Map-Week%2032-12.pdf

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Canada FluWatch
July 29 to August 11, 2012 (Weeks 31 & 32)
http://www.phac-aspc.gc.ca/fluwatch/.../index-eng.php

Excerpt:

Influenza Hospitalizations and Deaths (Aggregate Surveillance System)

In weeks 31 and 32, a total of 9 new laboratory-confirmed influenza-associated hospitalizations were reported: 55.6% were in those < 20 years of age (5) and 44.4% (4) were in those ≥20 years of age; 77.8% (7) were due to influenza A and 22.2% (2) were due to influenza B. All of the hospitalizations were reported from ON. No new ICU admissions were reported in weeks 31 and 32; however, 1 influenza A (unsubtyped) associated death was reported (ON) and was in a person between the ages of 20-44 years of age.

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

Ontario Influenza Bulletin I 2011‐2012
SURVEILLANCE SEASON (September 1, 2011 ? September 1, 2012)

Produced by: Surveillance Services, Public Health Ontario
Summary of current and season‐ to‐ date influenza activity

 Overall, influenza activity for the 2011‐2012 season from September 1,
2011, to September 1, 2012, was lower than the same period in previous years:

o A total of 3940 influenza cases were reported for the 2011‐2012 surveillance season to date.

o The majority of influenza cases reported for the 2011‐2012 season were influenza B, which
accounted for 74.5% (2937/3940) of cases this season. While influenza B was the dominant
influenza type, A(H1N1)pdm09 was the dominant influenza A subtype.

o Compared to the 2010‐2011 season, fewer influenza cases and outbreaks were reported.

Influenza B activity reached the highest level of activity seen in over five seasons.

o For the 3927 cases for which age is known, children under 5 years (864 cases) and adults 65
years of age and older (974 cases) accounted for 46.8% (1838/3927) of influenza cases
reported to date. The highest number of cases (640) occurred in the 1 to 4 year age group,
which represents 16.3% of cases.

o There were 1223 hospitalizations and 79 deaths reported among lab‐confirmed cases of
influenza reported in Ontario, which is fewer than compared to the 2010‐2011 season.

Among influenza cases that have been hospitalized, 24.7% (302/1223) were children under
5 years and 35.0% (428/1223) were adults over the age of 65 years (Table 2).

o There were 140 institutional influenza outbreaks reported this season, including 29
outbreaks of influenza A, 108 outbreaks of influenza B and three combined influenza A and
B outbreaks.

 Highlights of the cause(s) of ILI in Ontario from September 1, 2011 to September 1, 2012:

o Influenza B was the dominant circulating influenza virus for the 2011‐2012 season. Of the
965 influenza B isolates characterized at the National Microbiology Laboratory, 505 (35.0%)
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 Respiratory synctytial virus had the highest percent positivity for the season at 9.57%.
Influenza B had the second highest percent positivity among specimens submitted for
testing in the season (6.50%), and enterovirus had the third highest percent positivity
(5.09%). Influenza A had a 2.29% percent positivity for the season overall.

Full report:

http://www.oahpp.ca/resources/documents/flubulletin/Influenza%20Bulletin-Weeks%2034_35.pdf