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Covid-19 reinfection casts doubt on virus immunity: Study
Covid-19 reinfection in the United States -- the country worst hit by the pandemic -- and indicates that exposure to the virus may not guarantee future immunity.The patient, a 25-year-old Nevada man, was infected with two distinct variants of SARS-CoV-2, the virus that causes Covid-19, within a 48-day time frame.The second infection was more severe than the first, resulting in the patient being hospitalised with oxygen support.The paper noted four other cases of reinfection confirmed globally, with one patient each in Belgium, the Netherlands, Hong Kong and Ecuador.Experts said the prospect of reinfection could have a profound impact on how the world battles through the pandemic.In particular, it could influence the hunt for a vaccine --