2022-05-15-世界卫生组织-Influenza_Update_N°_419_13页_2mb

Influenza Update Summary (16 May 2022)

Overall Situation

• Globally, influenza activity continues to decrease following a March peak. Interpretation of surveillance data should be cautious due to COVID-19 impacts on healthcare-seeking behaviors, testing capacity, and restrictions.
• Reduced transmission was likely due to various COVID-19 measures.

Recommendations

• Monitor co-circulation of influenza and SARS-CoV-2.
• Enhance integrated surveillance systems.
• Intensify influenza vaccination campaigns.
• Clinicians should consider influenza in high-risk groups' differential diagnoses and follow national guidelines.

Regional Activity

• Northern Hemisphere Temperate Zone: Activity declined or stabilized. North America and Europe saw decreasing cases, primarily A(H3N2), with relatively high positivity rates in North America compared to pre-pandemic years. Asia reported varied activity.
• Southern Hemisphere (Oceania, South Africa, South America Temp): Activity remained low as expected, with exceptions in Argentina and Chile.
• Tropical Zones: Low activity reported regionally, with minor variations. COVID-19 cases caused disruptions.

Virus Specifics & COVID Impact

• Influenza A(H3N2) was prevalent globally, alongside B/Victoria in some areas and lesser amounts of other A types.
• COVID-19 infections increased (notably in non-sentinel data), highlighting potential strain on healthcare systems and mixing effects, but clear co-circulation data was complex due to varied lab reporting.

Suggested actions based on report