Weekly influenza reports

Fluwatch Summary

November 26 to December 2, 2017 (week 48)

  • At the national level, the influenza season began early this year. Influenza activity continues to increase sharply across Canada.
  • The majority of influenza detections continue to be A(H3N2), although a substantially greater number of influenza B detections has also been reported compared to previous seasons.
  • Several indicators of influenza activity are above the expected levels for this time of year, and most similar to levels observed during the 2014-15 influenza season, when A(H3N2) was the predominant circulating subtype.
  • Based on data from the southern hemisphere 2017 influenza season, vaccine effectiveness for A(H3N2) is anticipated to be low this year, but good protection is expected from the A(H1N1) and influenza B components of both the trivalent and quadrivalent vaccines.
  • For more information on the flu, see our Flu(influenza) web page.

The FluWatch interactive maps are not yet available for the 2017-18 season. We apologize for any inconvenience.

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