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.
All Keywords
【저자키워드】 COVID-19, coronavirus disease, viruses, zoonoses, SARS-CoV-2, coronavirus, Risk factors, vaccine efficacy, Contact tracing, omicron, respiratory diseases, COVID-19 vaccines, SARS-CoV-2 variants, infectiousness, attack rate, Japan, household contact, incidence, vaccine effectiveness, BA.2,
【저자키워드】 COVID-19, coronavirus disease, viruses, zoonoses, SARS-CoV-2, coronavirus, Risk factors, vaccine efficacy, Contact tracing, omicron, respiratory diseases, COVID-19 vaccines, SARS-CoV-2 variants, infectiousness, attack rate, Japan, household contact, incidence, vaccine effectiveness, BA.2,