2025-02-25-世界卫生组织-Influenza_Update_N°_515_1页_1mb

In the Northern Hemisphere, influenza activity remains elevated across regions like North America (predominantly A(H1N1)pd09), Central America and the Caribbean (A(H3N2)), Tropical South America (B), Northern Africa (A(H3N2)), Europe, and Asia, with an increase in a few countries compared to the last report. In the Southern Hemisphere, elevated activity was noted in some East African, South-East Asian, and Oceania countries. SARS-CoV-2 activity is low globally, with only a few exceptions reported in Central and South America, and East Africa. Data is sourced from various surveillance systems and smoothed over time for analysis.

The report highlights seasonal fluctuations and regional variations, offering insights into respiratory virus trends through data from the Global Influenza Surveillance and Response System.