The peak of viral load in people infected with the Omicron variant occurs between 3 and 6 days after the onset of symptoms, according to a study published by the Japanese Institute of Infectious Diseases, which looked at a sample of 21 people infected with the new virus. strain: 19 people in the study were vaccinated, two were not vaccinated. Four were asymptomatic and 17 had mild symptoms.
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The finding is different from what had been considered established, which pointed to the moment of greatest concentration of the virus from 24 hours before symptoms to at least 48 hours later.
This calculation is especially important at a time when the US has shortened the period of isolation of the infected to five days. In Brazil, Rio reduced the quarantine to seven days and São Paulo asked the Ministry of Health for a position on the subject. With the explosion of cases, there are countries where the percentage of the workforce on leave reaches 25%, harming several services, including health.
The new study was done by the National Institute of Infectious Diseases of Japan starting in December with only positive cases for Ômicron. Eighty-three masters of 21 people were collected, 19 of whom were vaccinated. Of the group, 17 were mild cases and four were asymptomatic.
“The amount of viral RNA was highest at 3 to 6 days after diagnosis or 3 to 6 days after symptom onset and gradually decreased over time, with a marked decrease after 10 days from diagnosis or symptom onset ( …) No infectious virus was detected in respiratory samples after 10 days from diagnosis or onset of symptoms. These findings suggest that vaccinated Omicron cases likely do not shed the virus 10 days after diagnosis or onset of symptoms,” the researchers say.
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