Effectiveness of CoronaVac and BNT162b2 Vaccines Against Severe Acute Respiratory Syndrome Coronavirus 2 Omicron BA.2 Infections in Hong Kong
Bingyi Yang, Irene Wong, Jingyi Xiao, Tim K. Tsang, Qiuyan Liao, Benjamin J. Cowling
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.
Topics & Concepts
AsymptomaticSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2)MedicineCoronavirus disease 2019 (COVID-19)2019-20 coronavirus outbreakConfidence intervalVirologyRespiratory systemInternal medicineDiseaseOutbreakInfectious disease (medical specialty)SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research StudiesVaccine Coverage and Hesitancy