"This current study reinforces concerns that reducing the self-isolation period to five days will increase the risk of highly infectious people spreading infection as they return to work or school," said virologist and molecular oncology professor Lawrence Young at the University of Warwick.
The study used samples from 2020, when the original virus strain was still dominant, so it was not clear how relevant the results are amid the spread of the Delta and Omicron variants, given different infectious and incubation periods. How much of a risk someone poses to others depends on factors including the viral load being shed, the symptoms of the patient and levels of immunity in potential contacts, said University of East Anglia's professor in medicine Paul Hunter.
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