Summary

· The positive rate of influenza virus testing was about the same as the last week in southern provinces, while remained low level in northern provinces. The detection proportion of A(H3N2) increased. There was 1 ILI outbreak reported in this week.

· Among influenza viruses antigenically characterized by CNIC since March 30, 2026, 44(97.8%) influenza A(H1N1)pdm09 viruses were characterized as A/Missouri/11/2025-like; 211(79.6%) influenza A(H3N2) viruses were characterized as A/Darwin/1454/2025(egg)-like, 233(87.9%) influenza A(H3N2)viruses were characterized as A/Darwin/1415/2025(cell)-like; 421(93.3%) influenza B/Victoria viruses were characterized as B/Tokyo/EIS13-175/2025-like.

· Among the influenza viruses tested by CNIC for antiviral resistance analysis since March 30, 2026, all A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to neuraminidase inhibitors; all A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to influenza polymerase inhibitors.