{"doi":"10.1111/irv.12973","title":"Vaccine effectiveness against COVID‐19 among symptomatic persons aged ≥12 years with reported contact with COVID‐19 cases, February–September 2021","abstract":"BACKGROUND: Individuals in contact with persons with COVID-19 are at high risk of developing COVID-19; protection offered by COVID-19 vaccines in the context of known exposure is poorly understood. METHODS: Symptomatic outpatients aged ≥12 years reporting acute onset of COVID-19-like illness and tested for SARS-CoV-2 between February 1 and September 30, 2021 were enrolled. Participants were stratified by self-report of having known contact with a COVID-19 case in the 14 days prior to illness onset. Vaccine effectiveness was evaluated using the test-negative study design and multivariable logistic regression. RESULTS: Among 2229 participants, 283/451 (63%) of those reporting contact and 331/1778 (19%) without known contact tested SARS-CoV-2-positive. Adjusted vaccine effectiveness was 71% (95% confidence interval [CI], 49%-83%) among fully vaccinated participants reporting a known contact versus 80% (95% CI, 72%-86%) among those with no known contact (p-value for interaction = 0.2). CONCLUSIONS: This study contributes to growing evidence of the benefits of vaccinations in preventing COVID-19 and support vaccination recommendations and the importance of efforts to increase vaccination coverage.","journal":"Influenza and Other Respiratory Viruses","year":2022,"id":283180,"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":6,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.8431,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2022-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":105979,"name":"Sara Kim","orcid":"0000-0002-1056-9896","position":1,"is_corresponding":false},{"id":105912,"name":"Edward A. Belongia","orcid":"0000-0001-7478-0415","position":2,"is_corresponding":false},{"id":105910,"name":"Huong Q. McLean","orcid":null,"position":3,"is_corresponding":false},{"id":268705,"name":"Jennifer P. King","orcid":"0000-0003-4627-1378","position":4,"is_corresponding":false},{"id":264490,"name":"Mary Patricia Nowalk","orcid":"0000-0002-1702-2690","position":5,"is_corresponding":false},{"id":264489,"name":"Richard K. Zimmerman","orcid":"0000-0001-5941-6092","position":6,"is_corresponding":false},{"id":400368,"name":"Krissy Moehling Geffel","orcid":"0000-0002-2103-4096","position":7,"is_corresponding":false},{"id":226888,"name":"Emily T. Martin","orcid":"0000-0002-5771-8895","position":8,"is_corresponding":false},{"id":231053,"name":"Arnold S. Monto","orcid":"0000-0003-3018-435X","position":9,"is_corresponding":false},{"id":335130,"name":"Lois Lamerato","orcid":"0000-0001-9955-6444","position":10,"is_corresponding":false},{"id":264491,"name":"Manjusha Gaglani","orcid":"0000-0002-3952-9230","position":11,"is_corresponding":false},{"id":88823,"name":"Eric P. Hoffman","orcid":"0000-0001-6470-5139","position":12,"is_corresponding":false},{"id":268716,"name":"Marcus Volz","orcid":"0000-0001-7358-5204","position":13,"is_corresponding":false},{"id":233085,"name":"Michael L. Jackson","orcid":"0000-0002-2340-0256","position":14,"is_corresponding":false},{"id":218071,"name":"Lisa A. Jackson","orcid":"0000-0002-1785-0218","position":15,"is_corresponding":false},{"id":264494,"name":"Manish Patel","orcid":"0000-0002-9407-8647","position":16,"is_corresponding":false},{"id":242317,"name":"Brendan Flannery","orcid":"0000-0001-5041-308X","position":17,"is_corresponding":false},{"id":249372,"name":"Jessie R. Chung","orcid":"0000-0001-5205-966X","position":0,"is_corresponding":true}],"reference_count":14,"raw_metadata":null,"created_at":"2026-07-19T00:29:23.777809Z","pmid":"35170231","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":[]}