2022-04-26-世界卫生组织-Weekly_epidemiological_update_on_COVID-19_-_27_April_2022_17页_1mb

报告摘要

COVID-19 new cases and deaths continue to decline globally since late March 2022. During week of 18–24 April 2022, 4.5 million new cases and 15,000 deaths reported, down 21% and 20% weekly.
Cases and deaths vary by region: Americas (+9%), Africa (+32%), South-East Asia (+41%) showed increases, likely due to reporting delays; Europe and Western Pacific saw decreases.

Omicron (99.7% of recent sequences) is the dominant variant, with higher transmissibility but similar or lower disease severity compared to Delta.
Vaccine effectiveness against Omicron is reduced for all outcomes, but higher for severe disease; booster doses improve protection.

Americas: Cases increased by 9%, deaths decreased by 19%, with large increases in specific countries.
Africa: Cases rose by 32%, deaths by 110%, driven by hotspot increases.
Eastern Mediterranean: Cases and deaths declined by 30% and 34%, respectively.
Europe: Cases and deaths fell by 28% and 33%, with peak reductions.
South-East Asia: Cases slightly decreased by 6%, but deaths increased markedly due to reporting delays.
Western Pacific: Cases and deaths dropped by 28% and 33%, with high case loads in some nations.

Variations in testing and reporting strategies may affect data accuracy.
Ongoing monitoring of Omicron sublineages and vaccine performance is essential for public health response.

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