A Spanish health care worker has reportedly tested positive for two variants of COVID-19 just 20 days apart — the shortest-known interval between infections.The 31-year-old woman, who was fully vaccinated and boosted, tested positive with the Delta variant in late December and then with Omicron in January, the BBC reported, citing Spanish researchers.She did not develop any symptoms after her first positive PCR test, but developed a cough and fever less than three weeks later, so she decided to get another test.
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