全球呼吸道病毒活动 每周更新 第516号

Influenza Activity - In the Northern Hemisphere, influenza activity is observed in North America (mainly A(H1N1)pdm09), Central America, and the Caribbean (mainly two influenza A subtypes) with mixed trends in activity across regions[3] - In the Southern Hemisphere, increased activity is noted in specific countries in East Africa (mainly A(H3N2) and B) and Southeast Asia (mainly A(H1N1)pdm09 and B), while overall activity remains stable or declining[3] SARS-CoV-2 Activity - Globally, SARS-CoV-2 activity remains low, although some regions in Central America, the Caribbean, tropical and temperate South America, and parts of Oceania report increased activity[4] - The proportion of positive samples for SARS-CoV-2 testing is monitored alongside influenza activity, indicating a need for ongoing surveillance[5] Monitoring and Data Sources - Data on respiratory virus monitoring is provided through collaboration with the World Health Organization, utilizing various methods across countries, which may lead to discrepancies in reported data[6] - The report includes results from sentinel surveillance and systematic virological monitoring, with limitations on comparability of positivity rates across different regions[6] Regional Reporting - The report summarizes activity by geographic regions, emphasizing that the groupings do not imply similar transmission patterns within each group[8] - The latest WHO regional monitoring reports are available for Africa, the Americas, the Eastern Mediterranean, Europe, Southeast Asia, and the Western Pacific[9]