Table 2. Summary of pre-pandemic data availability of FluWatch components for historical comparisons by influenza season.

Influenza season	FluWatch component
	Virological	Sentinel primary care provider ILI	FluWatchers	Outbreaks	P/T-SOSa	IMPACT
2014–2015	Yes	Yes	No	No	No	Yes
2015–2016	Yes	Yes	No	No	No	Yes
2016–2017	Yes	Yes	Yes	No	Yes	Yes
2017–2018	Yes	Yes	Yes	No	Yes	Yes
2018–2019	Yes	Yes	Yes	Yes	Yes	Yes
2019–2020b	Yes	Yes	Yes	Yes	Yes	Yes

Abbreviations: ILI, influenza-like illness; IMPACT, Canadian Immunization Monitoring Program ACTive; P/T-SOS, Province/Territory Severe Outcomes Surveillance

^a Only cumulative end-of-season data is available prior to the 2019–2020 season

^b In weekly comparisons to the 2019–2020 season, data from week 11 onwards is excluded due to the COVID-19 pandemic