2023-09-03-世界卫生组织-Influenza_Update_N°_453_11页_997kb

Summary:
This Influenza Update N° 453, dated 4 September 2023, provides a global overview of influenza surveillance based on data up to 20 August 2023. Influenza activity remained low globally, with recommendations for countries to monitor co-circulation with SARS-CoV-2 and consider influenza in differential diagnosis for high-risk groups, testing and treating according to national and WHO guidelines.

Key global findings include:

• Influenza detections were below seasonal thresholds in most regions.
• In Oceania, activity decreased, with influenza A(H1N1)pdm09 and B viruses predominant.
• In Southern Africa, activity was low, primarily influenza A(H3N2).
• Temperate South America showed low detections, with A and B viruses co-circulating, but SARI activity elevated in some countries.
• Tropical regions, including Africa and Asia, reported low activity, with SARS-CoV-2 positivity varying.
• Southern Hemisphere temperate zones had overall low influenza activity, but SARS-CoV-2 activity increased in some areas.

SARS-CoV-2 surveillance indicated just above 10% positivity in global sentinel data, with higher levels in some WHO regions like the Eastern Mediterranean. RSV activity was generally low, except in specific locations such as Western Australia.

Laboratory data from 108 countries showed 5040 influenza-positive specimens, with a majority being influenza A(H1N1)pdm09 or A(H3N2). Further details are available through WHO resources and regional offices.

For comprehensive data, refer to the sources listed in the original report.