COVID-19 again? Reinfection cases raise concerns over immunity
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The case of a man in the United States infected twice with COVID-19 shows there is much yet to learn about immune responses and also raises questions over vaccination, scientists said on Tuesday. The 25-year-old from Reno, Nevada, tested positive in April after showing mild symptoms, then got sick again in late May with a more serious bout, according to a case report in the Lancet Infectious Diseases medical journal. The report was published just hours after U.S. President Donald Trump, who was infected with COVID-19 and hospitalised earlier this month, said he believes he now has immunity and felt "so powerful".
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