2023-01-22-世界卫生组织-Influenza_Update_N°_437_13页_1mb

Influenza Update N°437 - 23 January 2023

Summary

▸ Recommendations

• Countries should monitor co-circulation of influenza and SARS-CoV-2 and report data to FluNet and regional platforms.
• Enhance integrated surveillance; step up vaccination campaigns in northern hemisphere countries.
• Clinicians should consider influenza in differential diagnosis, test and treat according to national guidelines.
• Interpret comparisons with previous seasons cautiously due to changed surveillance environments during the COVID-19 pandemic.
• Note possible under-reporting due to year-end holidays.

▸ Global Overview

• Influenza activity decreased overall but remained slightly elevated.
• Type A influenza viruses predominated, with A(H1N1)pdm09 slightly more common than A(H3N2).
• SARS-CoV-2 positivity decreased globally except in tropical Africa.

▸ Regional Highlights

North America

• Influenza activity decreased; A(H3N2) predominant. Higher hospitalizations seen in children and elderly.

Europe

• Moderate activity despite above-threshold positivity. A(H1N1)pdm09 and A(H3N2) co-circulated regionally. Many countries reported widespread activity.

Central & South America / Tropical Africa

• Influenza activity low or decreasing. A(H1N1)pdm09 predominant in some regions. Brazil reported high SARS-CoV-2 activity.

East Asia

• Activity low but elevated in Mongolia and Korea. A(H3N2) predominant.

Southern Hemisphere

• Activity decreased significantly, reaching expected low levels for season.

▸ Data Notes

• Influenza: Based on specimens (sentinel & non-sentinel data) up to 8 Jan 2023.
• SARS-CoV-2: Decrease noted, particularly in North America (>30% → ~20%).
• Comparisons with previous years subject to caution due to pandemic surveillance changes.

Limitations

• Final data for season end analysis not available likely due to holiday timing.
• Data collection is dependent on national reporting capacity.