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The UK Health Security Agency uses the definition of a possible reinfection as a case 90 days or more after a previous confirmed Covid infection, in part because it excludes those who simply shed the virus for longer after infection.from the UKHSA, from the start of the pandemic up to 9 January this year there were 425,890 possible reinfections, with 109,936 found in the week ending 9 January, accounting for almost 11% of all cases that week.
, after taking into account a host of factors Omicron was associated with somewhere between a 4.38 and 6.63-fold higher risk of reinfection, compared with Delta. It is not yet clear how well immune responses to Omicron protect against a second Omicron infection, or infections with new variants. “I would expect the risk of a second Omicron infection is a lot lower than the risk of Omicron following Delta after all you have developed antibodies to the actual Omicron spike protein,” said Paul Hunter, a professor in medicine at the University of East Anglia.
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