2022-01-24-世界卫生组织-Weekly_epidemiological_update_on_COVID-19_-_25_January_2022_22页_2mb

报告摘要

New Cases: Global cases increased by 5% (17-23 Jan 2022), with 21 million weekly cases reported—highest since pandemic began.
Deaths: Weekly deaths remained stable, totaling nearly 50,000, while cumulative deaths exceed 5.5 million.
Regional Trends:
- Increases: Eastern Mediterranean (39%), South-East Asia (36%), European (13%).
- Decreases: Africa (-31%), Americas (-10%), Western Pacific (stable).

Omicron Dominance: Omicron (98.8% of GISAID sequences) outcompetes Delta, with higher transmissibility and reinfection risk.
- Transmission: Growth advantage, higher secondary attack rate (e.g., 31% in Denmark).
- Severity: Lower risk of severe disease, but high hospitalization pressure due to volume.
Delta Decline: Lower reinfection risk than Omicron, but higher severe disease risk than Omicron.
Vaccine Impact: Omicron reduces vaccine effectiveness against infection/infection compared to Delta; booster doses improve protection against severe outcomes.

Americas: 7.3M new cases (-10%), led by US (4.2M) and Brazil (824K). Deaths (19,000) decrease but remain high in South Africa and Brazil.
Europe: 10M new cases (+13%), driven by France (+21%), Italy (+21%), Germany (+57%). Deaths (~21K) continue to rise.
Eastern Mediterranean: 479K new cases (+39%), with Tunisia (+67%) and Morocco (+10%) hotspots. Deaths (+15%) still high in Russia.
South-East Asia: 2.3M new cases (+36%), India (+33%) and Bangladesh (+181%) lead. Deaths increase by 44%.
Western Pacific: Cases stabilize at ~1M; Australia (+36%) and Japan (+181%) show increases. Deaths remain low.

Vaccination: Third doses improve protection against Omicron hospitalization.
Testing: PCR and antigen tests remain effective but require monitoring for Omicron-specific sensitivity.
Operational Updates: Highlight activities like training on bioinformatics across 21 countries and workshops on public health communication.
Data Limitations: Figures vary due to testing capacity, reporting delays, and surveillance gaps.

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