Summary

· The positive rate of influenza virus testing increased in southern provinces, while remained low level in northern provinces. The detection proportion of A(H3N2) increased. There was no ILI outbreak reported in this week.

· Among influenza viruses antigenically characterized by CNIC since March 30, 2026, 57(96.6%) influenza A(H1N1)pdm09 viruses were characterized as A/Missouri/11/2025-like; 301(82.9%) influenza A(H3N2) viruses were characterized as A/Darwin/1454/2025(egg)-like, 326(89.8%) influenza A(H3N2)viruses were characterized as A/Darwin/1415/2025(cell)-like; 512(94.1%) 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 and B viruses were sensitive to neuraminidase inhibitors, all but 1 influenza A(H3N2) were sensitive to neuraminidase inhibitors; all A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to influenza polymerase inhibitors.