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Text Equivalents - Fluwatch Report: December 9 to December 15, 2012 (Week 50)

Figure 1: Map of overall Influenza activity level by province and territory, Canada, Week 50

In week 50, the majority of regions reported influenza activity with four regions [in ON] reporting widespread influenza activity, nine regions [in BC(1), AB(2), SK(1), MB(1), ON(2), QC(2)] reporting localized activity, and 23 regions reporting sporadic activity [in all provinces and territories except NL, NT and NU].

Return to the Figure 1: Map of overall Influenza activity level by province and territory, Canada, Week 50

Figure 2: Number of influenza surveillance regions reporting widespread or localized activity, Canada, by report week, 2012-2013

In week 50, four regions reported widespread influenza activity, and nine regions reported localized activity.

Return to the Figure 2: Number of influenza surveillance regions reporting widespread or localized activity, Canada, by report week, 2012-2013

Figure 3: Overall number of influenza outbreaks, Canada, by report week, 2012-2013

Thirty-one new influenza outbreaks were reported in week 50: 24 in long-term-care facilities [in BC(1), AB(3), SK(3), MB(1), ON(13), QC(2) and NS(1)], four in hospitals [in AB(1) and ON(3)], and three in other facilities [in ON].

Return to the Figure 3: Overall number of influenza outbreaks, Canada, by report week, 2012-2013

Figure 4: Influenza tests reported and percentage of tests positive, Canada, by report week, 2012-2013

The percentage of positive influenza tests increased from 18.2% in week 49 to 24.2% in week 50.

Return to the Figure 4: Influenza tests reported and percentage of tests positive, Canada, by report week, 2012-2013

Figure 5: Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2012-2013

The percentage of positive influenza tests increased from 18.2% in week 49 to 24.2% in week 50. The percentage of tests positive for RSV is stable at 8.7%. The percentage positive for rhinovirus continued to decline from 9.8% to 6.6%. Parainfluenza and coronavirus detections declined slightly (from 4.0% to 3.1% and from 4.2% to 3.7%, respectively). Other percentages of positive tests remained low: adenovirus 1.4%; hMPV 1.0%.

Return to the Figure 5: Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2012-2013

Figure 6: Influenza strain characterizations, Canada, 2011-2012

Since the start of the season, the National Microbiology Laboratory (NML) has antigenically characterized 125 influenza viruses [87 A(H3N2), 16 A(H1N1)pdm09 , and 22 influenza B]. The 87 influenza A(H3N2) viruses were antigenically similar to the vaccine strain A/Victoria/361/2011. The 16 A(H1N1)pdm09  viruses were antigenically similar to the vaccine strain A/California/07/09. Among the influenza B viruses, 18 were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) and four were similar to B/Brisbane/60/2008 (Victoria lineage; component of the 2011-2012 seasonal influenza vaccine).

Return to the Figure 6: Influenza strain characterizations, Canada, 2011-2012

Figure 7: Influenza-like illness (ILI) consultation rates, Canada, by report week, 2012-2013 compared to 1996/97 through to 2011/12 seasons

The national influenza-like-illness (ILI) consultation rate in week 50 increased compared to the previous week: from 30.5 to 37.9 ILI consultations per 1,000 patient visits, which is within the expected level for this time of year.

Return to the Figure 7: Influenza-like illness (ILI) consultation rates, Canada, by report week, 2012-2013 compared to 1996/97 through to 2011/12 seasons