2021-08-15-世界卫生组织-Influenza_Update_N°_400_11页_1mb

报告摘要

Influenza Update N°400 Summary (16 August 2021)

Background: This report, based on data up to 01 August 2021, analyzes global influenza surveillance, incorporating COVID-19 impacts, as the ongoing pandemic has influenced health-seeking behaviors, staffing, testing priorities, and capacities in many member states.
Key Findings:
- Globally, influenza activity is lower than expected for this time of year, primarily due to COVID-19-related factors that likely reduced transmission.
- Influenza B viruses account for most detections (B-Victoria lineage predominant), with few cases reported in temperate zones of both hemispheres and some tropical regions.
- In temperate zones (southern and northern hemispheres), activity remains at inter-seasonal levels, indicating no significant peak or increase.
- In tropical zones (e.g., Africa, Asia, Americas), sporadic detections occur; for example, Mexico reports B-type in the Caribbean/Central America, India and Nepal see A(H3N2) increases in Southern Asia, and Eastern Africa reports B-type predominance.
- COVID-19 measures have played a role in reducing influenza spread, and SARS-CoV-2 surveillance shows rising positivity rates in some WHO regions.
SARS-CoV-2 Monitoring: Integration of SARS-CoV-2 data from sentinel surveillance indicates increased activity, with higher positivity rates in WHO American, European, and Southeast Asia Regions, while other regions show declines.
Recommendations: WHO urges countries to continue routine influenza surveillance, test for both influenza and SARS-CoV-2 where possible, and report data timely to global platforms to maintain effective monitoring despite pandemic disruptions.