2021-12-27-世界卫生组织-Weekly_epidemiological_update_on_COVID-19_-_28_December_2021_10页_1mb

COVID-19 Weekly Epidemiological Update Summary (Dec 28, 2021)

Global Overview

As of December 26, 2021, global COVID-19 cases increased by 11% week-over-week to nearly 5 million new cases, while deaths remained stable. Case growth was highest in the Americas (up 39%) and Africa (up 7%), but deaths saw the largest increase in Africa (up 72%). Europe and the Eastern Mediterranean Region reported decreases in deaths. The Americas and Europe accounted for the majority of cases and deaths per capita.

Brief Update on SARS-CoV-2 Omicron Variant

The Omicron variant shows high transmissibility, with a doubling time of 2-3 days, and has become dominant in some countries like the UK and US. It may lead to reduced hospitalization risks compared to Delta, but further data is needed on severe outcomes, especially with vaccination and prior infection. Testing methods remain effective, but monoclonal antibodies may be less effective. Early evidence suggests it is less severe, but clinical markers like oxygen use and ventilation outcomes require more research.

WHO Regional Overviews

• Americas: 39% increase in cases and 7% in deaths; US and Brazil reported highest new cases and deaths.
• African Region: 7% rise in cases, but 72% increase in deaths; South Africa and Zimbabwe saw sharp spikes.
• Eastern Mediterranean: No significant change in cases and deaths; Israel and Jordan reported increases in cases.
• Europe: Stable cases but 12% decrease in deaths; UK and France led in new cases.
• South-East Asia: 12% drop in cases, but 9% rise in deaths; India and Viet Nam had fluctuating reports.
• Western Pacific: Cases and deaths similar to previous week; Australia reported a sharp increase in cases.

Key data varies by region, with notable increases in transmissibility but evolving severity assessments.