The incubation period from infection to symptoms or a first positive COVID-19 test has decreased as the coronavirus has evolved, 𝗱𝗿𝗼𝗽𝗽𝗶𝗻𝗴 𝗳𝗿𝗼𝗺 𝟱 𝗱𝗮𝘆𝘀 𝘁𝗼 𝟯.𝟱 𝗱𝗮𝘆𝘀, 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.
United States Latest News, United States Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
A boost for African research from ChinaLetter to the Editor
Read more »
China battles forest fires as fears linger over harvestThe southwestern Chinese regions of Chonqging and Sichuan were battling fires on Tuesday as they awaited a long-anticipated drop in temperatures over the next week, but the country's important autumn harvest remained under serious threat.
Read more »
Climate change in China hikes price of rare mushroom, a delicacy in AsiaFor years, China has been one of the world’s largest suppliers of a rare delicacy — the matsutake mushroom. But this year, a prolonged drought and heat waves across the country’s south have slashed the harvest and sent prices skyrocketing.
Read more »
China Slashes Lending Rates Again, One Week After Surprise Cuts in Key RatesThe PBOC has cut its five-year loan prime rate to 4.30% from 4.45% and its one year- loan prime rate to 3.65% from 3.70%.
Read more »
China Trims Lending Rates Again, One Week After Surprise Cuts in Key RatesThe PBOC has cut its five-year loan prime rate to 4.30% from 4.45% and its one year- loan prime rate to 3.65% from 3.70%.
Read more »