Weekly influenza reports

FluWatch summary

March 10 to March 16, 2024 (week 11)

At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic

  • In week 11, the percentage of tests positive for influenza was 9.4% and a total of 2,418 laboratory detections (1,156 influenza A and 1,262 influenza B) were reported.

Syndromic

  • The percentage of visits for influenza-like illness (ILI) was 1.7% in week 11. The percentage of visits for ILI is within expected levels typical of this time of year.
  • The percentage of FluWatchers reporting cough and fever was 1.3% in week 11. The percentage of FluWatchers reporting cough and fever remains below expected for this time of year.

Outbreaks

  • From August 27, 2023 to March 16, 2024 (weeks 35 to 11), 1,063 laboratory-confirmed influenza outbreaks have been reported (10 laboratory-confirmed influenza outbreaks were reported in week 11).

Severe Outcomes

  • From August 27, 2023 to March 16, 2024 (weeks 35 to 11), 3,934 influenza-associated hospitalizations were reported by participating provinces and territories. Adults aged 65 years of age and older accounted for 47% of reported hospitalizations. The highest cumulative hospitalization rates were among adults 65 years of age and older (126/100,000) and children under 5 years of age (80/100,000).
  • From October 1, 2023 to March 16, 2024 (weeks 40 to 11), 902 influenza-associated pediatric hospitalizations were reported from a total of 3,569 positive influenza tests across nine sentinel hospital sites. 

Other Notes

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