2023-03-05-世界卫生组织-Influenza_Update_N°_440_11页_1mb

报告摘要

Countries should monitor co-circulation of influenza and SARS-CoV-2 viruses and report data to FluNet or regional platforms.
Enhance integrated surveillance and increase influenza vaccination campaigns, particularly in northern hemisphere countries, to prevent severe disease and hospitalizations.
Clinicians should consider influenza in differential diagnoses for high-risk groups and follow national guidance for testing and treatment.
Interpret current data cautiously due to changes in respiratory virus surveillance during the COVID-19 pandemic.

Influenza activity continued to decline after peaking late in 2022.
Influenza A viruses predominated, with a slightly higher proportion of A(H1N1)pdm09 subtyped viruses.
The proportion of influenza B virus detections increased during the reporting period.
Globally, SARS-CoV-2 positivity remained around 20% from sentinel surveillance, decreasing in some regions.
RSV activity was generally low or decreasing worldwide.

North America: Low influenza activity observed, with most indicators below seasonal norms. Canada had low ILI and influenza-associated hospitalizations, while the US saw stable positivity rates. A(H3N2) was predominant in the USA, and A(H1N1)pdm09 in Canada. SARS-CoV-2 co-circulation noted.
Europe: Influenza detections stable, with increased sentinel positivity. High activity reported in several East and Northern European countries; influenza B predominant in some areas. RSV activity low.
Asia: East Asia saw a steep increase in influenza activity (predominantly A(H1N1)pdm09) in China, but decreased in other East Asian countries. South-East Asia reported elevated B virus detections, mainly in Malaysia, Singapore, and Thailand.
Africa: Western and Middle Africa had low detections, while Eastern Africa showed decreasing activity but remained elevated in some areas. RSV generally low.
Caribbean/South America: Influenza activity decreasing in most tropical regions, with low activity driving mainly by A(H3N2) and B viruses. RSV activity varied.
Southern Hemisphere (Temperate Zones): Influenza activity at inter-seasonal levels, stable across Oceania and South Africa.

SARS-CoV-2 surveillance was integrated where possible, with WHO encouraging countries to enhance reporting through Global Influenza Surveillance and Response System (GISRS) platforms.
Data completeness varies due to COVID-19 impacts on surveillance.

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