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• W4205872581 abstract "We previously reported a household secondary attack rate (SAR) for SARS-CoV-2 of 18.9% through June 17, 2021. To examine how emerging variants and increased vaccination have affected transmission rates, we searched PubMed from June 18, 2021, through January 7, 2022. Meta-analyses used generalized linear mixed models to obtain SAR estimates and 95%CI, disaggregated by several covariates. SARs were used to estimate vaccine effectiveness based on the transmission probability for susceptibility ( VES,p ), infectiousness ( VEI,p ), and total vaccine effectiveness ( VET,p ). Household SAR for 27 studies with midpoints in 2021 was 35.8% (95%CI, 30.6%-41.3%), compared to 15.7% (95%CI, 13.3%-18.4%) for 62 studies with midpoints through April 2020. Household SARs were 38.0% (95%CI, 36.0%-40.0%), 30.8% (95%CI, 23.5%-39.3%), and 22.5% (95%CI, 18.6%-26.8%) for Alpha, Delta, and Beta, respectively. VEI,p , VES,p , and VET,p were 56.6% (95%CI, 28.7%-73.6%), 70.3% (95%CI, 59.3%-78.4%), and 86.8% (95%CI, 76.7%-92.5%) for full vaccination, and 27.5% (95%CI, -6.4%-50.7%), 43.9% (95%CI, 21.8%-59.7%), and 59.9% (95%CI, 34.4%-75.5%) for partial vaccination, respectively. Household contacts exposed to Alpha or Delta are at increased risk of infection compared to the original wild-type strain. Vaccination reduced susceptibility to infection and transmission to others.Household secondary attack rates (SARs) were higher for Alpha and Delta variants than previous estimates. SARs were higher to unvaccinated contacts than to partially or fully vaccinated contacts and were higher from unvaccinated index cases than from fully vaccinated index cases." @default.
• W4205872581 created "2022-01-26" @default.
• W4205872581 creator A5049692788 @default.
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• W4205872581 creator A5069878224 @default.
• W4205872581 creator A5073320237 @default.
• W4205872581 date "2022-01-11" @default.
• W4205872581 modified "2023-10-02" @default.
• W4205872581 title "Household secondary attack rates of SARS-CoV-2 by variant and vaccination status: an updated systematic review and meta-analysis" @default.
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• W4205872581 doi "https://doi.org/10.1101/2022.01.09.22268984" @default.
• W4205872581 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35043125" @default.
• W4205872581 hasPublicationYear "2022" @default.
• W4205872581 type Work @default.
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• W4205872581 hasAuthorship W4205872581A5049692788 @default.
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• W4205872581 hasAuthorship W4205872581A5055585673 @default.
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