2022-10-30-世界卫生组织-Influenza_Update_N°_431_12页_1mb

报告摘要

Global Influenza Activity: Overall levels remained low, with influenza A(H3N2) predominant where subtyped. In the northern hemisphere, trends were increasing, while the southern hemisphere saw a plateau or decrease.
Regional Variations:
- Northern Hemisphere: Influenza activity increased, driven by A(H3N2). Europe and North America showed rising cases, Central Asia and East Asia had stable low levels. Southern Africa and Oceania reported decreases.
- Southern Hemisphere: Temperate zones saw low activity; temperate South America reported increases in some countries like Argentina and Chile.
- Tropical Regions: South America and Africa had low activity, with A(H3N2) predominant in many areas.
Dominant Strains: Influenza A(H3N2) was the most common subtype globally, accounting for over 80% of subtyped A viruses. Influenza B/Victoria lineage also circulated in some regions.
SARS-CoV-2 Co-circulation: SARS-CoV-2 positivity increased in some sentinel surveillance systems, while recommendations include integrated surveillance and monitoring for both viruses to prevent severe outcomes.
Recommendations: Countries are advised to enhance influenza surveillance, consider vaccination campaigns, and include influenza in differential diagnoses. Public health actions focus on reducing severe disease and hospitalizations, especially in high-risk groups.