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WHO Collaborating Center for Reference and Research on Influenza
Chinese National Influenza Center
National Institute for Viral Disease Control and Prevention, China CDC
December 30, 2024 to January 5, 2025 (Week 1)
(All data are preliminary and may change as more reports are received)
Summary
Influenza detections increased in the southern provinces and northern provinces.
A(H1N1)pdm09 was predominated. There were 145 ILI outbreaks reported in
week 1.
Among influenza viruses antigenically characterized by CNIC since April 1,
2024, 1999(96.8%) influenza A(H1N1)pdm09 viruses were characterized as
A/Victoria/4897/2022-like; 392(56.0%) influenza A(H3N2) viruses were
characterized as A/Thailand/8/2022(egg)-like, 453(64.7%) influenza A(H3N2)
viruses were characterized as A/Thailand/8/2022(cell)-like; 997(99.1%) influenza
B/Victoria viruses were characterized as B/Austria/1359417/2021-like.
Among the influenza viruses tested by CNIC for antiviral resistance analysis
since April 1, 2024, all but 51 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. ...
Chinese National Influenza Center
National Institute for Viral Disease Control and Prevention, China CDC
December 30, 2024 to January 5, 2025 (Week 1)
(All data are preliminary and may change as more reports are received)
Summary
Influenza detections increased in the southern provinces and northern provinces.
A(H1N1)pdm09 was predominated. There were 145 ILI outbreaks reported in
week 1.
Among influenza viruses antigenically characterized by CNIC since April 1,
2024, 1999(96.8%) influenza A(H1N1)pdm09 viruses were characterized as
A/Victoria/4897/2022-like; 392(56.0%) influenza A(H3N2) viruses were
characterized as A/Thailand/8/2022(egg)-like, 453(64.7%) influenza A(H3N2)
viruses were characterized as A/Thailand/8/2022(cell)-like; 997(99.1%) influenza
B/Victoria viruses were characterized as B/Austria/1359417/2021-like.
Among the influenza viruses tested by CNIC for antiviral resistance analysis
since April 1, 2024, all but 51 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. ...
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