2022-06-12-世界卫生组织-Influenza_Update_N°_421_13页_1mb

报告摘要

Globally, influenza activity further decreased but some areas showed slight increases (e.g., southern hemisphere, South Africa).
A(H3N2) was the predominant subtype globally, followed by A(H1N1)pdm09.
B/Victoria became the most common B-lineage, but overall B detections remained low.

Southern Hemisphere: In temperate zones, mild increases were noted globally. Australia saw sharp rises in A (mostly A(H3N2)) and RSV; some cases of SARI in NZ, with coinfection noted. South Africa reported increased detections, but COVID-19 amplified sharply. South America: activity decreased in Argentina/Paraguay but increased in Chile/Uruguay. RSV picked up considerably.
Tropical Countries: Most places reported low activity, dominated by A(H3N2). Countries like El Salvador/Nicaragua saw some increases.
Northern Hemisphere: Activity continued to decline in both North America and Europe. Rates also remained low in Asia and Africa. Europe saw below-epidemic-threshold positivity; in North America, positivity was higher than usual but activity was decreasing. RSV remained low.

Countries are urged to prepare for potential co-circulation of influenza and SARS-CoV-2.
Steps recommended: Integrated surveillance, enhanced vaccination, and ensuring clinicians test for influenza.
Overall COVID-19 positivity from sentinel surveillance was rising during the period (around 30% globally), more so in the Americas (around 20-30%) and Western Pacific (around 30%), than other regions (below 10%).

Data is based on reports via FluNet from WHO's GISRS labs (approx. 247k tests, 14.6k positive) and regional labs (sentinel: ~7k positive out of ~41k tested; non-sentinel: ~99k positive out of ~595k tested).
For specific country/country group details, refer to separate WHO Regional Office influenza reports.
Note: Reported data still requires caution due to COVID-19 impact on testing, seeking care, and different surveillance systems.

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