2021-06-21-世界卫生组织-Cumulative_number_of_confirmed_human_cases_for_avian_influenza_A_H5N1_reported_to_WHO,_2003-2021,_22_June_2021_4页_67kb

Summary of WHO-Reported Avian Influenza A(H5N1) Human Cases (2003-2021)

Key Statistics:

• Total confirmed human cases reported to WHO: 862
• Total deaths associated with these cases: 455
• All reported cases are laboratory-confirmed by WHO.

Epidemiological Trends:

• Cumulative cases show a peak in the early-to-mid-2000s (e.g., up to 2009 with 468 cumulative cases) and a decline in later years (e.g., 155 cumulative cases up to 2019). No cases were reported for 2020 and 2021.
• Cases are mostly concentrated in certain regions, with no additional cases after 2019, indicating reduced transmission over time.

Country Breakdown:

• Egypt had the highest number of cases (359) and deaths (120).
• Indonesia and Vietnam also reported significant cases, with 200 and 127 respectively.
• Other notable contributors: China (53 cases), Cambodia (56 cases), and Turkey (12 cases).

Context and Limitations:

• Data includes only laboratory-confirmed cases, based on illness onset dates.
• WHO estimates are based on reports up to June 2021, with no cases in 2020-2021.