Each of them was matched with at least one control participant: a person with the same factors, such as age and sex, but who tested negative during that time period.
Researchers studied more than a thousand people in California who tested positive for SARS-CoV-2 between February and September 2021. Credit: Ceng Shou Yi/NurPhoto via Getty Long chats, indoors: where masks matterĪn analysis of hundreds of COVID-19 cases suggests where face masks matter most: during long encounters and indoors. Spending long stretches of time with a person with COVID-19 increases the chance of catching the disease, but masking and staying outdoors reduces the risk.
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