Summary

· The positive rate of influenza virus testing increased in southern provinces, while decreased in northern provinces. Influenza B predominated. There were 26 ILI outbreaks reported in this week.

· Among influenza viruses antigenically characterized by CNIC since October 1, 2025, 101(94.4%) influenza A(H1N1)pdm09 viruses were characterized as A/Victoria/4897/2022-like; 558(21.6%) influenza A(H3N2) viruses were characterized as A/Croatia/10136RV/2023(egg)-like, 1030(39.9%) influenza A(H3N2)viruses were characterized as A/District of Columbia/27/2023(cell)-like; 640(97.9%) influenza B/Victoria viruses were characterized as B/Austria/1359417/2021-like.

· Among the influenza viruses tested by CNIC for antiviral resistance analysis since October 1, 2025, all but 2 influenza A(H1N1)pdm09 and 2 influenza A(H3N2) were sensitive to neuraminidase inhibitors, all B viruses were sensitive to neuraminidase inhibitors; all A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to influenza polymerase inhibitors.