A new observational study out of the U.K. has found that those who contract the Omicron variant of COVID-19 experience different symptoms that are usually less severe and last shorter than those who are infected with the Delta variant.
"The prevalence of symptoms that characterise an omicron infection differs from those of the Delta SARS-CoV-2 variant, apparently with less involvement of the lower respiratory tract and reduced probability of hospital admission," the study's authors wrote.
Researchers from King's College London studied the symptoms of 63,002 vaccinated U.K. participants who tested positive for COVID-19 between June 1, 2021 and Nov. 27, 2021, when the Delta variant was the dominant strain circulating, as well as Dec. 22, 2021 to Jan. 17, 2022, when Omicron became dominant.
The study did not compare symptoms, hospital admissions or duration of infection by the two variants in unvaccinated individuals. Omicron's shorter symptom duration was also more pronounced in those with three vaccine doses, highlighting the importance of booster shots, researchers say.
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