2021-09-06-世界卫生组织-Weekly_epidemiological_update_on_COVID-19_-_7_September_2021_19页_1mb

COVID-19 Weekly Epidemiological Update Summary (Edition 56, 7 September 2021)

Global Overview

• Globally, new COVID-19 cases and deaths stabilized over the past month.
• New cases reached 4.4 million in the last week (30 August–5 September), deaths 68,000.
• Declines occurred in Africa, South-East Asia, and the Eastern Mediterranean.
• Increases noted in the Americas (19% cases, 17% deaths) and Europe (20% deaths).
• India and the US reported significant case increases.

Special Focus: Variants of Interest and Concern

• Delta variant shows higher transmissibility and severity in infection outcomes.
• Alpha variant also increases severity and hospitalization risks.
• Vaccines show reduced effectiveness against Delta infection but remain high against severe disease, with waning immunity playing a role.
• New evidence highlights Delta's 1.4% secondary attack rate with pre-symptomatic transmission.

WHO Regional Overviews

• Americas: Sharp rise in cases (19%) and deaths (17%), US and Brazil drivers.
• African Region: Decline in cases (25%) and deaths (26%), South Africa leading.
• Eastern Mediterranean: Cases decreased 16%, deaths stable.
• Europe: Cases stable, deaths increased 20%.
• South-East Asia: Cases dropped 9%, deaths 21% in deaths; India up 8%.
• Western Pacific: Cases slowed, deaths declined 8%.

Operational Summary

• Highlighted activities include vaccine support, genomic sequencing expansion, and risk communication.

Note: Refer to Annexes for detailed data and variant specifics.