Participants collected and submitted nasal swabs weekly and with the onset of acute illness. The study, which followed participants through the Alpha and Delta waves, captured both asymptomatic and symptomatic infections with SARS-CoV-2. Participants completed weekly surveys about symptoms experienced in the preceding week and, if they had symptoms, what preventive measures they took such as isolating or wearing a mask.
The study did not find that COVID-19 vaccination reduced transmission within households but did reduce overall infection risk. COVID-19 transmission in households with children found that the virus that causes COVID-19 was transmitted from people of all ages and from those with or without symptoms. However, staying in a separate room from other household members while sick significantly reduced the odds of transmission of the virus
Data collection was conducted before the emergence of the Omicron variant and vaccines for children in the United States.
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