![]() How do the UK’s rules compare with those of other countries? ![]() These tests are a great way to determine if you are infectious.” “The approach adopted in the UK is sensible based on seven days and two consecutive negative lateral flow tests. “On a balance of probabilities this is probably correct,” he said, although he suggested the situation may be different for some people, such as those who are immunosuppressed, and it may not hold if future variants are not picked up by lateral flow tests. The UK Health Security Agency says the new approach for England “reflects latest evidence on how long cases transmit the virus for, and supports essential public services and supply chains over the winter, while still limiting the spread of the virus”.ĭr Richard Tedder, a member of the Clinical Virology Network, said the shift was a compromise, and was based on the assumption that people with two negative tests are unlikely to transmit coronavirus to contacts. “This infectious period can occur before the onset of symptoms and last for between two to three days after you become symptomatic,” he said. However, Prof Lawrence Young, a virologist at Warwick Medical School, said it appeared that the time from infection to becoming infectious was shorter with the Omicron variant, at two or three days, and it was very likely that the infectious period was also shorter and probably affected by vaccination status. It has been clear for some time that people can be infectious from about two days before they develop symptoms.Įstimates for how long an infected person remains contagious vary, but as Harvard Medical School notes: “By the 10th day after Covid symptoms begin, most people will no longer be contagious, as long as their symptoms have continued to improve and their fever has resolved.”ĭr Julian Tang, a professor of respiratory sciences at the University of Leicester, said although the Omicron variant showed some escape from vaccine-induced and past immunity, he would expect the immune response to follow a similar timeline to that in previous variants. How long is someone with Covid infectious for? In Scotland, Wales and Northern Ireland, the self-isolation period for those who test positive remains 10 days, although rules around close contacts vary between the nations. Since 22 December, people in England who have tested positive for Covid have been allowed to cut their self-isolation from 10 days to seven if they have negative lateral flow tests on days six and day seven.įully vaccinated close contacts of someone who has tested positive do not need to self-isolate, but those who are not vaccinated have to isolate for 10 days.
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