Summary

· The positive rate of influenza virus testing increased slightly in southern provinces, while remained low level in northern provinces, with A(H3N2) dominated. There were 2 ILI outbreaks reported in this week.

· Among influenza viruses antigenically characterized by CNIC since March 30, 2026, 72(94.7%) influenza A(H1N1)pdm09 viruses were characterized as A/Missouri/11/2025-like; 355(82.6%) influenza A(H3N2) viruses were characterized as A/Darwin/1454/2025(egg)-like, 387(90.0%) influenza A(H3N2)viruses were characterized as A/Darwin/1415/2025(cell)-like; 605(93.7%) 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 viruses were sensitive to neuraminidase inhibitors, all but 1 A(H3N2) and 2 B/Victoria viruses were sensitive to neuraminidase inhibitors; all A(H1N1)pdm09, A(H3N2) and B/Victoria viruses were sensitive to influenza polymerase inhibitors.