Weekly influenza reports

April 14 to April 20, 2024 (week 16)

At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year.

Virologic

• In week 16, the percentage of tests positive for influenza was 6.4% and a total of 1,647 laboratory detections (348 influenza A and 1,299 influenza B) were reported.

Syndromic

• The percentage of FluWatchers reporting cough and fever was 1.2% in week 16. The percentage of FluWatchers reporting cough and fever remains below expected levels for this time of year.

Outbreaks

• From August 27, 2023 to April 20, 2024 (weeks 35 to 16), 1,178 laboratory-confirmed influenza outbreaks have been reported (8 laboratory-confirmed influenza outbreaks were reported in week 16).

Severe Outcomes

• From August 27, 2023 to April 20, 2024 (weeks 35 to 16), 4,265 influenza-associated hospitalizations were reported by participating provinces and territories. Adults aged 65 years of age and older accounted for 46% of reported hospitalizations. The highest cumulative hospitalization rates were among adults 65 years of age and older (132/100,000) and children under 5 years of age (94/100,000).
• From October 1, 2023 to April 20, 2024 (weeks 40 to 16), 1,056 influenza-associated pediatric hospitalizations were reported from a total of 4,302 positive influenza tests across ten sentinel hospital sites.

Other Notes

• Weekly reporting of laboratory detections of influenza, SARS-CoV-2, and other seasonal respiratory viruses will continue via our Respiratory Virus Detections Surveillance System.