A 25-year-old man becomes first in the U.S. to contract coronavirus twice, with second infection ‘more severe’

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Dr. Sonia Macieiewski (R) and Dr. Nita Patel, Director of Antibody discovery and Vaccine development, look at a sample of a respiratory virus at Novavax labs in Rockville, Maryland on March 20, 2020, one of the labs developing a vaccine for the coronavirus, COVID-19.Andrew Caballero-Reynolds | AFP | Getty ImagesA 25-year-old man in the U.S. state of Nevada has contracted the coronavirus on two separate occasions, a study in the Lancet Infectious Diseases journal showed, with the patient becoming seriously ill following the second infection.It is the first confirmed case of a U.S. patient becoming re-infected with Covid-19, and the fifth known case reported worldwide. The resident of Washoe County, who had no known immune disorders or history of significant underlying conditions, required hospital treatment on testing positive for Covid-19 for the second time. He has now recovered, though the case raises further questions about the prospect of developing protective immunity against the coronavirus. To date, more than 37.8 million people have contracted Covid-19 worldwide, with 1.08 million related deaths, according to data compiled by Johns Hopkins University. The head of emergencies at the WHO said earlier this month that its “best estimates” indicate that roughly 1 in 10 people globally may have been …

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