Effectiveness of CoronaVac and BNT162b2 Vaccines Against Severe Acute Respiratory Syndrome Coronavirus 2 Omicron BA.2 Infections in Hong Kong . (2nd September 2022)

• Record Type: Journal Article
• Authors: Yang, Bingyi; Wong, Irene O L; Xiao, Jingyi; Tsang, Tim K; Liao, Qiuyan; Cowling, Benjamin J
• Is Part Of: Journal of infectious diseases. Volume 226:Number 8(2022)
• Page Start: 1382
• Page End: 1384
• Publication Date: 2022-09-02
• Subjects: vaccine effectiveness -- SARS-CoV-2 -- asymptomatic -- booster dose; Communicable diseases -- Periodicals; Diseases -- Causes and theories of causation -- Periodicals; Medicine -- Periodicals; Communicable Diseases -- Periodicals; Electronic journals; 616.9
• DOI: 10.1093/infdis/jiac360
• Languages: English
• ISSNs: 0022-1899

Abstract

Abstract: There is limited evidence on vaccine effectiveness against asymptomatic or mild Omicron infections. We estimated that recent third doses of messenger RNA or inactivated vaccines reduced the risk of self-reported infection by 52% (95% confidence interval, 17%–73%) among randomly sampled adults during the Omicron BA.2–dominated surge in Hong Kong. Abstract : Using self-reported vaccination and testing results for coronavirus disease 2019 among a random adult population in Hong Kong, we estimated that third doses of messenger RNA or inactivated vaccines could provide moderate level of protection during the Omicron BA.2 surge.