Respiratory Viruses Surveillance Bulletin: Epidemiological Week 9, 2026

Overview

• Regional influenza positivity is 9% and SARS-CoV-2 positivity is below 5% in week 9 of 2026 (Figure 1).
• The predominant circulating influenza virus changed from influenza A (47% of all detections) to influenza B(Victoria) (53% of all detections) (Figure 2).
• Influenza activity has increased in most northern hemisphere countries and corresponds to increases in influenza B(Victoria) detections.
• Influenza activity has decreased across all southern hemisphere countries, except New Zealand.