2023-10-08-世界卫生组织-Influenza_Update_N°_455_12页_1mb

Influenza Update Summary (WHO, October 2, 2023)

Global Situation

• Influenza detections remained low globally based on surveillance data up to 17 September 2023.
• The predominant influenza A subtypes were A(H1N1)pdm09 and A(H3N2), with some circulation of influenza B/Victoria.
• National Influenza Centres reported data from 107 countries: 6247 influenza A cases (80.37%) and 1526 B cases (19.63%), with 28.87% A(H1N1)pdm09 and 71.13% A(H3N2).

Recommendations

• Countries advised to monitor co-circulation of influenza and SARS-CoV-2 through integrated surveillance and report data to RespiMART (FluNet and FluID) directly or via regional platforms.
• Clinicians should include influenza in differential diagnosis for high-risk groups and adhere to national and WHO guidelines for testing and treatment.
• WHO encourages integrated surveillance, especially in countries with GISRS reagent kits.

Regional Breakdown

• Oceania: Influenza activity decreased; A and B viruses cocirculated. New Zealand and Pacific Islands saw low activity.
• Southern Africa: Activity below seasonal threshold; B/Victoria lineage increased slightly.
• Temperate South America: Detections low; A and B viruses cocirculating, except in Chile where positivity was elevated.
• Caribbean and Central America: Influenza activity low; B and A(H1N1)pdm09 predominant in Central America.
• Tropical Africa (Western, Middle, Eastern): Activity low overall, but Western Africa showed increases in A and A(H1N1)pdm09 detections.
• Southern Asia and South-East Asia: Low activity in Southern Asia; South-East Asia had elevated but decreasing influenza activity with A predominant.
• Northern Hemisphere (temperate zones): Low influenza indicators; Europe and North America reported low activity, with some COVID-19 mortality noted.

Other Viruses

• SARS-CoV-2 surveillance showed slight decreases in positivity (around 10% or less globally), except in some regions.
• RSV activity was generally low where surveillance was available.
• Limited country reporting affects data completeness; detailed insights in regional WHO reports.

For more details, refer to the referenced WHO sources.