2025-01-07-世界卫生组织-Influenza_Update_N°_508_1页_1mb

Influenza Activity: In the Northern hemisphere, influenza activity was elevated and increasing in regions such as Europe, Central America, the Caribbean, Western and Northern Africa, and Asia. Virus types varied, with A(H1N1)pdm09 predominant in many areas. In the Southern hemisphere, activity was elevated in Tropical South America and Eastern Africa, with B viruses mainly detected; it also increased in Melanesia with A(H1N1)pdm09. Overall, activity declined or remained stable in most reporting countries.

SARS-CoV-2 Activity: SARS-CoV-2 activity remained elevated in parts of South America, Middle Africa, and Southern Asia, with increased cases reported in specific single countries but similar or declining activity elsewhere.

Additional Notes: Data from this summary are based on reports to WHO's Global Influenza Surveillance and Response System (GISRS), with viral surveillance conducted through various systematic methods. Percent positivity smoothed over a three-week period, noting geographical variations limit direct comparisons.