Weekly influenza reports

FluWatch summary

January 15, 2023 to January 21, 2023 (week 3)

  • At the national level, influenza activity continues to decline. Influenza activity is now at levels typically seen in late spring/early summer.

Virologic

  • In week 3, the percentage of tests positive for influenza was 1.5% and a total of 798 laboratory detections (779 influenza A and 19 influenza B) were reported.
  • Among subtyped influenza A detections in week 3, 52% (44) were influenza A(H1N1) and 48% (41) were influenza A(H3N2).
  • Among detections for which age information was reported in week 3, 33% (119) of detections were in individuals aged 65+ years old.

Syndromic

  • The percentage of visits for influenza-like illness (ILI) was 1.7% in week 3. The percentage visits for ILI is below average levels typical of this time of year.
  • The percentage of FluWatchers reporting fever and cough was 1.3% in week 3. The percentage of FluWatchers reporting cough and fever is below seasonal levels.

Outbreaks

  • From August 28, 2022 to January 21, 2023 (weeks 35 to 3), 617 laboratory-confirmed influenza outbreaks have been reported (one new laboratory-confirmed influenza outbreak was reported in week 3).

Severe Outcomes

  • The highest cumulative hospitalization rate up to week 3 is among adults 65 years of age and older (126/100,000 population) and children under 5 years of age (118/100,000 population). The overall cumulative hospitalization rate this season to date is 45/100,000 population.

Other Notes

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