●Influenza detections were decreasing in the southern provinces and northern provinces this week, A(H1N1)pdm09 was predominated, followed by A(H3N2) and B/Victoria. There were 12 ILI outbreaks reported in week 21.

●Among influenza viruses antigenically characterized by CNIC since October 2, 2023, 292(95.7%) influenza A(H1N1)pdm09 viruses were characterized as A/Victoria/4897/2022-like; 873(35.0%) influenza A(H3N2) viruses were characterized as A/Darwin/9/2021(egg)-like, 863(34.6%) influenza A(H3N2) viruses were characterized as A/Darwin/6/2021(cell)-like; 2106(99.0%) 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 2, 2023, all but 1 influenza A(H1N1)pdm09 were sensitive to neuraminidase inhibitors, all A(H3N2) and B viruses were sensitive to neuraminidase inhibitors; all A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to endonuclease inhibitors.