Ontario Respiratory Virus Tool

Key findings for Mar. 1 – 7, 2026 (week 9)

COVID-19

• Percent positivity was low (6.3%), and overall activity was lower than the previous week.
  • Highest percent positivity in those <1 years (8.0%) and 65 years and older (7.0%).

Influenza

• Percent positivity was low (3.3%), and overall activity was similar to the previous week.
  • Influenza B activity has increased in recent weeks.
    • Influenza B percent positivity was highest in children 5-11 years (28.3%) and 12-19 years (14.6%).
  • H3N2 was the most common subtype this season. See Influenza Strain Details tab.
• Antiviral-resistant isolates identified in Ontario are summarized on the Influenza Strain Details tab.

RSV

• Percent positivity was moderate (6.2%), and overall activity was lower than the previous week.
  • Highest percent positivity in children under 5: 17.1% (<1 year) and 18.0% (1–4 years).