Reinfections have been rising sharply with Omicron, and they've now been added to official daily data.
Those reinfections are likely to be people infected by the Alpha or Delta variants and then infected again by the more contagious Omicron.
He adds: "Reducing this time limit would increase the risk of primary infections that shed virus for a long time being recorded as reinfections." Others say the data on people entering hospital with Covid is more important to focus on, given the fact that vaccine protection against infection wanes quickly.
Although vaccines are good at protecting against serious illness, the protection they offer against infection from Omicron tails off quickly and, after 20 weeks, is likely to be very low.
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