2022-08-16-世界卫生组织-Weekly_epidemiological_update_on_COVID-19_-_17_August_2022_21页_1mb

报告摘要

Cases: From 8 to 14 August 2022, new weekly COVID-19 cases decreased by 24% to 5.4 million, with cumulative cases at 587 million.
Deaths: Weekly deaths decreased by 6% to 15,000, with cumulative deaths at 6.4 million.
Regional Trends: All WHO regions reported case decreases (Western Pacific to South-East Asia). Deaths increased in Western Pacific and South-East Asia, decreased elsewhere.

Omicron remains dominant, accounting for 99.3% of global SARS-CoV-2 sequences.
BA.5 and its subvariants rose in prevalence, while BA.2.75 showed higher transmissibility and immune evasion in preliminary studies.
Vaccine effectiveness against Omicron declined over time, especially for infection and symptomatic disease, but boosters improved protection.

Americas: 17% case decrease; cases increased in some territories like Falkland Islands, but USA and Brazil dominated case numbers.
Africa: 38% case decrease; deaths decreased, but case increases in Niger and Mozambique stood out.
Eastern Mediterranean: 30% case decrease; Lebanon and Iran reported case increases.
Europe: 38% case decrease; high case burden in Germany, Italy, and Russia.
South-East Asia: 11% case decrease; India had the highest new cases, but Sri Lanka and Myanmar showed significant increases.
Western Pacific: 18% case decrease; Japan and Korea had high case and death rates due to variant surges.

Omicron variants reduced vaccine effectiveness for all outcomes, but boosters provided better protection against severe disease.
Studies showed rapid waning of immunity, emphasizing the need for booster doses.

Annexes include detailed data notes, variant classifications, and references for further details.

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