Key trends
Weekly summary – April 16, 2026
Current respiratory activity is measured in consideration of recent past respiratory seasons.
- The proportions of emergency department and primary care visits for respiratory illness continue to decrease, especially among children, and remain at moderate levels.
- In Canada, most indicators of influenza activity were low and stable in the most recent reporting week. Influenza B activity continued to gradually increase while influenza A gradually decreased. Influenza B is circulating within expected levels for this time of year; however, trends vary by region.
In the USA, seasonal influenza activity continues to decrease in most areas of the country. Influenza A activity is low across all regions while trends in influenza B activity vary by region.
In the European Union/European Economic Area (EU/EEA), influenza circulation and hospitalisations remain low and continue to decrease across all age groups.
- In Canada, indicators of RSV activity were stable or decreasing in the most recent reporting week.
In the USA, RSV activity started later than expected in most regions, though illness is not more severe compared with recent seasons. This unusual timing means higher levels of RSV activity may continue into April in many regions. Emergency department visits and hospitalisations for RSV are highest among infants and children less than 4 years old.
In the EU/EEA, RSV activity and hospitalisations remain elevated, although recent trends suggest that overall levels are decreasing. Children under five years continue to account for most hospital admissions.
- In Canada, indicators of COVID-19 activity were stable or decreasing in the most recent reporting week. Indicators are at or near the lowest levels recorded this season.
In the USA, COVID-19 activity is low in most areas of the country.
In the EU/EEA, SARS-CoV-2 circulation remains low across all age groups, with few hospitalisations.
