Ontario Respiratory Virus Tool

Key findings for November 9 – November 15, 2025 (surveillance week 46)

COVID-19

• Percent positivity was low (5.6%), and overall activity was higher than the previous week.
• Highest percent positivity in those <1 years (6.3%) and 65 years and older (6.9%).
• Compared to the same time last year activity is lower based on multiple indicators.

Influenza

• Percent positivity was low (5.9%), and overall activity was higher than the previous week.
• Percent positivity surpassed 5% signalling the start of the season.
• Influenza A percent positivity increased in all age groups and remains highest in children (5-11 years) at 24.8% and adolescents (12-19 years) at 27.6%.
• H3N2 was more common than H1N1 this week and season to date. See Influenza Strain Details tab.
• No antiviral-resistant isolates identified in Ontario. See Influenza Strain Details tab.

RSV

• Percent positivity was low (1.3%), and overall activity was lower than the previous week.
  • Highest percent positivity in children under 5: 5.4% (<1 year) and 10.5% (1–4 years).