MedscapeUnivadisEnglish EditionMedscapeUnivadisXPlease confirm that you would like to log out of Medscape.If you log out, you will be required to enter your username and password the next time you visit.>Editor's note: Find the latest COVID-19 news and guidance in Medscape'sA 25-year-old man from Nevada and a 42-year-old man in Virginia experienced second bouts of COVID-19 about 2 months after they tested positive the first time. Gene tests show both men  had two slightly different strains of the virus, suggesting that they  caught the infection twice. Researchers say...…MedscapeUnivadisEnglish EditionMedscapeUnivadisXPlease confirm that you would like to log out of Medscape.If you log out, you will be required to enter your username and password the next time you visit.>Editor's note: Find the latest COVID-19 news and guidance in Medscape'sA 25-year-old man from Nevada and a 42-year-old man in Virginia experienced second bouts of COVID-19 about 2 months after they tested positive the first time. Gene tests show both men  had two slightly different strains of the virus, suggesting that they  caught the infection twice. Researchers say...WW…