With Omicron spreading across the world faster than any previous variant, cases of reinfection among people who caught Covid-19 earlier in the pandemic are rising.
Neil Ferguson, epidemiologist at Imperial College London, estimated last week that between 10 and 15 per cent of Omicron cases were among people who had already been infected with another variant. Other scientists have called this a plausible estimate.
Almost all reinfections so far will have been of people who originally caught another strain of the Sars-Cov-2 virus. No evidence has yet been found of anyone being infected twice by Omicron itself, including from South Africa where this latest variant of concern has been circulating longest — for at least two months.
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