欧洲疾控中心：2023年流感病毒欧洲外部质量评估计划报告（英文版）

Influenza epidemics occur every winter with high impact on disease burden, hospitalisations and excess mortality in the countries of Europe. To understand the characteristics of circulating influenza viruses during seasonal epidemics, virological influenza surveillance is performed, and detected viruses are further characterised at national influenza centres (NICs) that are part of the wider network of the WHO Global Influenza Surveillance and Response System (GISRS). External quality assessm