A 25-year-old Nevada man appears to be the first documented case of COVID-19 reinfection in the United States, researchers say.Genetic tests indicate the patient was infected with two different varieties of the virus, the team at the University of Nevada Reno School of Medicine and the Nevada State Public Health Laboratory reported.The patient was first diagnosed with coronavirus in April after he had a sore throat, cough, headache, nausea and diarrhea, the researchers wrote in a…

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