Chinese Weekly Influenza Surveillance Report - Chinese National Influenza Center - for trend analysis only

[Mary Wilson]

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Chinese Weekly Influenza Surveillance Report

January 6 to 12, 2025 (Week 2)

(All data are preliminary and may change as more reports are received)

Summary

 Influenza detections increased in the southern provinces, declined in northern

provinces in this week. A(H1N1)pdm09 was predominated. There were 118 ILI

outbreaks reported in week 2.

 Among influenza viruses antigenically characterized by CNIC since April 1,

2024, 2130(96.9%) influenza A(H1N1)pdm09 viruses were characterized as

A/Victoria/4897/2022-like; 411(56.8%) influenza A(H3N2) viruses were

characterized as A/Thailand/8/2022(egg)-like, 473(65.4%) influenza A(H3N2)

viruses were characterized as A/Thailand/8/2022(cell)-like; 1009(98.9%)

influenza B/Victoria viruses were characterized as B/Austria/1359417/2021-like.

 Among the influenza viruses tested by CNIC for antiviral resistance analysis

since April 1, 2024, all but 57influenza 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. ...

https://ivdc.chinacdc.cn/cnic/en/Surveillance/WeeklyReport/202501/P020250116400892864828.pdf
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[Mary Wilson]

WHO Collaborating Center for Reference and Research on Influenza
Chinese National Influenza Center
National Institute for Viral Disease Control and Prevention, China CDC​

Chinese Weekly Influenza Surveillance Report
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January 13 to 19, 2025 (Week 3)
(All data are preliminary and may change as more reports are received)

Summary

Influenza detections declined in the southern provinces and northern provinces.

A(H1N1)pdm09 was predominated. There were 20 ILI outbreaks reported in

week 3.

Among influenza viruses antigenically characterized by CNIC since April 1,

2024, 2383(97.1%) influenza A(H1N1)pdm09 viruses were characterized as

A/Victoria/4897/2022-like; 411(56.8%) influenza A(H3N2) viruses were

characterized as A/Thailand/8/2022(egg)-like, 473(65.4%) influenza A(H3N2)

viruses were characterized as A/Thailand/8/2022(cell)-like; 1009(98.9%)

influenza B/Victoria viruses were characterized as B/Austria/1359417/2021-like.

Among the influenza viruses tested by CNIC for antiviral resistance analysis

since April 1, 2024, all but 63 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. ...

https://ivdc.chinacdc.cn/cnic/en/Surveillance/WeeklyReport/202501/P020250122525335262720.pdf


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