{"doi":"10.1093/cid/ciaa1558","title":"The Household Secondary Attack Rate of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2): A Rapid Review","abstract":"BACKGROUND: Although much of the public health effort to combat coronavirus disease 2019 (COVID-19) has focused on disease control strategies in public settings, transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) within households remains an important problem. The nature and determinants of household transmission are poorly understood. METHODS: To address this gap, we gathered and analyzed data from 22 published and prepublished studies from 10 countries (20 291 household contacts) that were available through 2 September 2020. Our goal was to combine estimates of the SARS-CoV-2 household secondary attack rate (SAR) and to explore variation in estimates of the household SAR. RESULTS: The overall pooled random-effects estimate of the household SAR was 17.1% (95% confidence interval [CI], 13.7-21.2%). In study-level, random-effects meta-regressions stratified by testing frequency (1 test, 2 tests, >2 tests), SAR estimates were 9.2% (95% CI, 6.7-12.3%), 17.5% (95% CI, 13.9-21.8%), and 21.3% (95% CI, 13.8-31.3%), respectively. Household SARs tended to be higher among older adult contacts and among contacts of symptomatic cases. CONCLUSIONS: These findings suggest that SARs reported using a single follow-up test may be underestimated, and that testing household contacts of COVID-19 cases on multiple occasions may increase the yield for identifying secondary cases.","journal":"Clinical Infectious Diseases","year":2020,"id":53322,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":119,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9583,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2020-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":231884,"name":"Leonardo Martínez","orcid":"0000-0003-0954-8489","position":1,"is_corresponding":false},{"id":271680,"name":"Fernando Alarid‐Escudero","orcid":"0000-0001-5076-1172","position":2,"is_corresponding":false},{"id":22312,"name":"Joshua A. Salomon","orcid":"0000-0003-3929-5515","position":3,"is_corresponding":false},{"id":271681,"name":"David M. Studdert","orcid":"0000-0003-0585-5537","position":4,"is_corresponding":false},{"id":231886,"name":"Jason R. Andrews","orcid":"0000-0002-5967-251X","position":5,"is_corresponding":false},{"id":271682,"name":"Jeremy D. Goldhaber‐Fiebert","orcid":"0000-0002-4007-5192","position":6,"is_corresponding":false},{"id":273086,"name":"Stanford-CIDE Coronavirus Simulation Model (SC-COSMO) Modeling Group","orcid":null,"position":7,"is_corresponding":false},{"id":30810,"name":"Elizabeth T. Chin","orcid":"0000-0001-5774-4236","position":8,"is_corresponding":false},{"id":271683,"name":"Anneke L. Claypool","orcid":"0000-0002-2280-2296","position":9,"is_corresponding":false},{"id":273087,"name":"Mariana Fernández","orcid":null,"position":10,"is_corresponding":false},{"id":271684,"name":"Valeria Gracia","orcid":"0000-0003-4853-2922","position":11,"is_corresponding":false},{"id":271685,"name":"Andrea Luviano","orcid":"0000-0002-2624-4850","position":12,"is_corresponding":false},{"id":273088,"name":"Regina Isabel Medina Rosales","orcid":null,"position":13,"is_corresponding":false},{"id":22310,"name":"Marissa B Reitsma","orcid":"0000-0001-7276-4876","position":14,"is_corresponding":false},{"id":271686,"name":"Theresa Ryckman","orcid":"0000-0003-3214-3228","position":15,"is_corresponding":false},{"id":271679,"name":"Hannah F. Fung","orcid":"0000-0002-5686-1534","position":0,"is_corresponding":true}],"reference_count":37,"raw_metadata":null,"created_at":"2026-07-18T20:44:25.349797Z","pmid":"33045075","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}