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SARS-CoV-2 B.1.1.529 (Omicron) Variant Transmission Within Households — Four U.S. Jurisdictions, November 2021–February 2022
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3 04 2022
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Source: MMWR Morbidity Mortal Weekly Rep. 71(9):341-346
[PDF-166.18 KB]
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Journal Article:Morbidity and Mortality Weekly Report (MMWR)
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Description:The B.1.1.529 (Omicron) Variants, first detected in November 2021, was responsible for a surge in U.S. infections with SARS-CoV-2, the Virus that causes COVID-19, during December 2021-January 2022 (1). To investigate the effectiveness of Prevention strategies in household settings, CDC partnered with four U.S. jurisdictions to describe Omicron household Transmission during November 2021-February 2022. Persons with sequence-confirmed Omicron infection and their household contacts were interviewed. Omicron Transmission occurred in 124 (67.8%) of 183 households. Among 431 household contacts, 227 were classified as having a case of COVID-19 (attack rate [AR] = 52.7%).| The ARs among household contacts of index patients who had received a COVID-19 booster dose, of fully vaccinated index patients who completed their COVID-19 primary series within the previous 5 months, and of unvaccinated index patients were 42.7% (47 of 110), 43.6% (17 of 39), and 63.9% (69 of 108), respectively. The AR was lower among household contacts of index patients who isolated (41.2%, 99 of 240) compared with those of index patients who did not isolate (67.5%, 112 of 166) (p-value <0.01). Similarly, the AR was lower among household contacts of index patients who ever wore a mask at home during their potentially infectious period (39.5%, 88 of 223) compared with those of index patients who never wore a mask at home (68.9%, 124 of 180) (p-value <0.01). Multicomponent COVID-19 Prevention strategies, including up-to-date vaccination, isolation of infected persons, and mask use at home, are critical to reducing Omicron Transmission in household settings.
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ISSN:0149-2195 (print);1545-861X (digital);
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Pubmed ID:35238860
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Pubmed Central ID:PMC8893332
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Pages in Document:6 pdf pages
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Volume:71
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Issue:9
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