2025-04-21-世界卫生组织-Cumulative_number_of_confirmed_human_cases_for_avian_influenza_A_H5N1_reported_to_WHO,_2003-2025,_22_April_2025_5页_125kb

Avian influenza A(H5N1) reported cases to WHO show increasing human impact over time, with distinct higher burden periods. Key trends include: a cumulative rise in cases from 468 in 2003-2009 to 973 total cases reported, mostly in Asia and Africa; deaths peaked at 282 in the earliest period but declined to 44 in later years; high-risk countries included Egypt (constantly leading in cases) and Vietnam; cases peaked in 2003-2009 then peaked again in 2020-2024; a notable decrease in cumulative cases post-2019 may reflect control measures. The virus remains a significant threat, with lab-confirmed cases and inevitable contamination issues potentially obscuring full severity.