The incubation period from infection to symptoms or a first positive COVID-19 test has decreased from 5 days to 3.5 as the coronavirus has evolved, according to a new study.
With the Alpha variant, the incubation period was about 5 days, which fell to 4.5 for Beta, 4.41 for Delta, and 3.42 for Omicron.
Researchers at Peking University and Tsinghua University in China analyzed 142 studies published between December 2019 and February 2022. The studies included data about more than 8,100 COVID-19 patients. About 84% of the studies included patients infected with the wild-type COVID strain, while 3.5% included patients infected with multiple strains, and 7.7% involved unknown strains.Overall, the average incubation period of all the variants was 6.57 days, ranging from 1.8 to 18.87 days. Among people ages 60 and older, the average incubation was 7.43 days. Among children, the average incubation period was 8.82 days.
The average incubation periods fell over time with each new variant, the study authors found. For Alpha, which had one study with 6,374 patients, the incubation period was about 5 days. For Beta, which had one study with 10 patients, the incubation period was 4.5 days. For Delta, which had six studies with 2,368 patients, the incubation period was 4.41 days. For Omicron, which had five studies with 829 patients, the incubation period was 3.42 days.
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