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Reported Influenza Hospitalizations and Deaths in Canada: 2011-12 to 2015-16 (data to August 13, 2016)

Note: Flu seasons run from week 35 (August) to week 34 (August)

In Canada the active influenza season generally starts in November and ends in March. The number of hospitalizations and deaths associated with influenza are used to measure the severity of the influenza seasons. Every week, a subset of provincial and territorial Ministries of Health report the number of hospitalized cases and deaths associated with influenza to the Public Health Agency of Canada.

See FightFlu.ca for more information.

Hospitalizations with influenza

The first figure (Figure 1) shows the reported number of hospitalizations with influenza over the past four influenza seasons, from the 2011/2012 season up to August 13, 2016 of the 2015/2016 season. The 2011/2012 season following the pandemic (2009/2010) was relatively mild, followed by the 2012/2013, 2013/2014 and 2014/2015 seasons, when a considerable number of adult hospitalizations were reported. The total number of adult hospitalizations reported over the 2014/2015 season exceeded those in any previous influenza season (including the pandemic). Over the last four influenza seasons, the number of paediatric hospitalizations reported has been relatively stable.

To date, 5360 hospitalizations have been reported from participating provinces and territories for the 2015/2016 influenza season.

Figure 1. Reported number of hospitalizations by influenza season, CanadaFigure 1 - Footnote *, 2011-12 to 2015-16 (Data current as of August 13, 2016)

Figure 1 - Footnote *
It is important to note that the number of hospitalizations and deaths reported represent a subset of all influenza-associated hospitalizations and deaths in Canada as not all Provinces and Territories participate in reporting. Number of participating Provinces and Territories: 2011-12: 10, 2012-13: 8, 2013-14: 9, 2014-15: 10, 2015-16: 10

Text Equivalent - Figure 1

Deaths with influenza

The second figure (Figure 2) shows the reported number of deaths with influenza over the past four influenza seasons, from the 2011/2012 season up to August 13, 2016 of the 2015/2016 season. In the past four influenza seasons, the number of deaths with influenza has followed a similar pattern to the reported hospitalizations (Figure 1). The number of deaths among children has been relatively consistent since the 2011/2012 season. The total number of adult deaths reported over the 2014/2015 season exceeded those in any previous influenza season (including the pandemic). To date, 270 deaths have been reported from participating provinces and territories for the 2015/2016 influenza season.

Figure 2. Reported number of deaths by influenza season, CanadaFigure 2 - Footnote *, 2011-12 to 2015-16 (Data current as of August 13, 2016)

Figure 2 - Footnote *
It is important to note that the number of hospitalizations and deaths reported represent a subset of all influenza-associated hospitalizations and deaths in Canada as not all Provinces and Territories participate in reporting. Number of participating Provinces and Territories: 2011-12: 10, 2012-13: 8, 2013-14: 9, 2014-15: 10, 2015-16: 10

Text Equivalent - Figure 2