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Although the chances are low, a person may still get another new Covid infection soon after recovery from a Covid infection. Recently a 31-year old healthcare worker caught Covid again just 20 days after a prior Covid infection, despite being vaccinated. https://www.bbc.com/news/health-61161529 Did the vaccines and booster doses fail? No, the vaccines are continuing to protect people for the worst effects of the virus but cannot prevent all infections.