关键词： BA.2 COVID-19 COVID-19 vaccines Contact tracing Japan Omicron SARS-CoV-2 SARS-CoV-2 variants attack rate coronavirus coronavirus disease household contact incidence infectiousness respiratory diseases risk factors vaccine effectiveness vaccine efficacy viruses zoonoses

Mesh ： Humans COVID-19 / prevention & control epidemiology Japan / epidemiology SARS-CoV-2 / immunology COVID-19 Vaccines / immunology administration & dosage Family Characteristics Vaccine Efficacy Vaccination Contact Tracing Male Female

来  源：   DOI：10.3201/eid3007.230968   PDF(Pubmed)

Abstract：
We calculated attack rates for household contacts of COVID-19 patients during the SARS-CoV-2 Omicron BA.2-dominant period in Japan. Attack rates among household contacts without recent (<3 months) vaccination was lower for contacts of index patients with complete vaccination than for contacts of index patients without complete vaccination, demonstrating indirect vaccine effectiveness.
摘要：
我们计算了日本SARS-CoV-2OmicronBA.2主导时期COVID-19患者家庭接触者的攻击率。在近期（<3个月）未接种疫苗的家庭接触者中，完全接种疫苗的接触者的攻击率低于未完全接种疫苗的接触者。证明间接疫苗的有效性。
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