Weekly influenza reports

FluWatch summary

May 5 to May 11, 2024 (week 19)

At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year. The percentage of tests positive for influenza fell below 5% this week. This suggests that Canada is nearing the end of the 2023-2024 influenza season at the national level.

Virologic

  • In week 19, the percentage of tests positive for influenza was 4.2% and a total of 1,077 laboratory detections (238 influenza A and 839 influenza B) were reported.

Syndromic

  • The percentage of FluWatchers reporting cough and fever was 1.0% in week 19. The percentage of FluWatchers reporting cough and fever remains below expected levels for this time of year.

Outbreaks

  • From August 27, 2023 to May 11, 2024 (weeks 35 to 19), 1,207 laboratory-confirmed influenza outbreaks have been reported (2 laboratory-confirmed influenza outbreaks were reported in week 19).

Severe Outcomes

  • From August 27, 2023 to May 11, 2024 (weeks 35 to 19), 4,386 influenza-associated hospitalizations were reported by participating provinces and territories. Adults aged 65 years of age and older accounted for 45% of reported hospitalizations. The highest cumulative hospitalization rates were among adults 65 years of age and older (134/100,000) and children under 5 years of age (98/100,000).
  • From October 1, 2023 to May 11, 2024 (weeks 40 to 19), 1,111 influenza-associated pediatric hospitalizations were reported from a total of 4,641 positive influenza tests across ten sentinel hospital sites.

Other Notes

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