docs admin-#1297832-v2b-weekly influenza surveillance bulletins - 2012-2013 season

7/30/2019 Docs Admin-#1297832-V2b-Weekly Influenza Surveillance Bulletins - 2012-2013 Season

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Local Influenza Surveillance BulletinReleased December 10, 2012

Figure 1: Number of laboratory confirmed cases of influenza by week and type, Waterloo Region,August 26, 2012 December 1, 2012

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m b e r o

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Influenza A

Influenza B

No. of Cases by Type

Influenza A Total 103 pH1N1 2 H3 38H3N2 2 Other (non-pH1N1) 0Not sub-typed 1 61

Influenza B 0

Total 103

Weekly Influenza ActivityLevel 2

No activitySporadicLocalizedWidespread

Figure 2: Number of laboratory confirmed cases of influenza by week, Waterloo Region,2007-08 to 2012-13 3

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75

3 5 36 3 7 38 3 9 40 4 1 42 4 3 44 4 5 46 4 7 48 4 9 50 5 1 52 1 2 3 4 5 6 7 8 9 1 0 11 1 2 13 1 4 15 1 6 17 1 8 19 2 0 21 2 2 23 2 4 25 2 6 27 2 8 29 3 0 31 3 2 33 3 4

September October November December January February March April May June July August

N u m

b e r o

f C a s e s

Week of the Year

Previous 5 seasons average (excluding 2009-2010)

2012-13

Source: iPHIS, Ministry of Health & Long-Term Care, extracted December 10, 2012

1 Not sub-typed includes all Influenza A cases that had a sub- type of blank, untypeable or not -subtyped. 2 For definitions of influenza activity levels: http://www.phac-aspc.gc.ca/fluwatch/12-13/def12-13-eng.php 3

The weeks refer to FluWatch weeks, which are established by the Public Health Agency of Canada.

Influenza Activity: August 26, 2012 to December 1, 2012 (Weeks 35-48)
http://www.phac-aspc.gc.ca/fluwatch/12-13/def12-13-eng.phphttp://www.phac-aspc.gc.ca/fluwatch/12-13/def12-13-eng.phphttp://www.phac-aspc.gc.ca/fluwatch/12-13/def12-13-eng.phphttp://www.phac-aspc.gc.ca/fluwatch/12-13/def12-13-eng.php


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Table 1: Influenza indicators, Waterloo Region and Ontario, August 26, 2012 December 1, 2012*Indicator Waterloo Region OntarioLaboratory confirmed influenza cases 103 404 Population-based rate per 100,000 18.8 3.0 Number of influenza hospitalizations 11 54 Population-based hospitalization rate per 100,000 2.01 0.39 Number of deaths 3 4 Population-based mortality rate per 100,000 0.55 0.03 Note: Unless explicitly stated, Region of Waterloo Public Health data is reported according to the week corresponding to the cases episode date while provincial data is reported according to the week corresponding to the date the case wasreported to the respective health unit. Often these dates are the same, but they can differ depending on a number of factors including, but not limited to, the timing of a specimen submission, the current volume of submissions, and the time when the health unit receives the lab result. This may result in a slight discrepancy in the total weekly case counts.* Waterloo Region and Ontario data is current as of December 1, 2012.

Sources: iPHIS, Ministry of Health & Long-Term Care, extracted December 10, 2012; Ontario Respiratory Virus Bulletin: Week 48.

Influenza-Like-Illness The number of Influenza-Like Illness (ILI)

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visits is a useful indicator of the level of community transmission of influenza and the resulting burden on primary care practices. As such, we are tracking the ILI consultationrate at post- secondary institutions 5 7 health services in Waterloo Region as well as in select primary carepractices. ILI information may change on a weekly basis as data is collected from additional primary carepractices. As a result, rates reported in the current bulletin may not be the same as those reported in previousbulletins.

Figure 3: Influenza-Like-Illness (ILI) consultations per 1,000 patient visits, Waterloo Region,August 26, 2012 December 1, 2012

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I L I C o n s u

l t a t i o n s p e r 1

, 0 0 0 P a t i e n t V i s i t s

Week

* Insufficient or data quality issues for Waterloo Region for weeks 35, 36, 37, and 38.Source: Post- secondary institution health services departments and select local primary care practice , extracted December 10, 2012.

4 Case definition for ILI is: acute onset of respiratory illness with fever and cough and with one or more of the following - sorethroat, arthralgia, myalgia, or prostration which is likely due to influenza. In children under 5, gastrointestinal symptoms mayalso be present. In patients under 5 or 65 and older, fever may not be prominent. 5 Post-secondary institutions include Conestoga College, Wilfred Laurier University, and University of Waterloo

Proxy Indicators for Influenza Surveillance


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Figure 4: Influenza-Like-Illness (ILI) consultations per 1,000 patient visits, Ontario,August 26, 2012 December 1, 2012

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Notes : Provincially, ILI cases are counted through the Public Health Agenc y of Canadas sentinel physician FluWatchprogram. Due to continued data cleaning efforts, the values may change slightly from week-to-week.Source: Public Health Agency of Canada FluWatch sentinel physician sites, extracted December 10, 2012.

Hospital Based Data Monitoring the number of Emergency Room (ER) visits may provide an indication of the level of communitytransmission of influenza and the resulting burden on hospitals. The figures below include aggregated datafrom all three acute care hospitals within the Region of Waterloo: Cambridge Memorial Hospital, Grand River Hospital, and St. Marys General Hospital.

Figure 5: Emergency Room Visits per 100,000 population, by week, Waterloo Region, 2008-2012 6 8

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35* 36* 37* 38* 39 4 0 41 4 2 43 4 4 45 4 6 47 4 8 49 5 0 51 5 2 1 2 3 4 5 6 7 8 9 10 1 1 12 13* 14 1 5 16 1 7 18 1 9 20 2 1 22

September October November December January February March April May June

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t e o

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Week & Month of the Year

2012-2013 Average 2008-09 to 2011-12

* Indicates missing data for one or more hospitals for the reporting week.Source: Cambridge Memorial Hospital, Grand River Hospital, and St. Mary s General Hospital

6 The weeks refer to FluWatch weeks, which are established by the Public Health Agency of Canada.


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School Absenteeism Monitoring school absenteeism rates is a useful indicator of the level of community transmission of influenza.

An absenteeism rate of 10% or greater has been identified as a threshold by the Ministry of Health and LongTerm Care (MOHLTC) to signify higher than expected levels of school absenteeism. The figure below showsthe per cent absent of all schools and the average per cent absent of the previous three years of all schools inWaterloo Region, by week.

Figure 6: School absenteeism, Waterloo Region, September 4, 2012 December 1, 2012

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P e r c e n t a

b s e n t

Surveillance Week

2012-13 Previous 3 year average

*Indicates incomplete/partial data due to school closure (e.g. PA day, secondary school exams, statutory holiday, school break, or snow day).

Source: Waterloo Region District School Board and Waterloo Catholic District School Board

Ontario Respiratory Virus Bulletins:http://www.oahpp.ca/resources/ontario-respiratory-virus-bulletin.html

Public Health Agency of Canada FluWatch Reports:http://www.phac-aspc.gc.ca/fluwatch/12-13/index-eng.php

For provincial and national influenza information, please visit the following websites:
http://www.oahpp.ca/resources/ontario-respiratory-virus-bulletin.htmlhttp://www.phac-aspc.gc.ca/fluwatch/12-13/index-eng.phphttp://www.phac-aspc.gc.ca/fluwatch/12-13/index-eng.phphttp://www.phac-aspc.gc.ca/fluwatch/12-13/index-eng.phphttp://www.oahpp.ca/resources/ontario-respiratory-virus-bulletin.html

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