Lorena Guardian, 52, of Las Vegas donates plasma at St. Rose Dominican Hospital, Siena campus i …

Lorena Guardian, 52, of Las Vegas donates plasma at St. Rose Dominican Hospital, Siena campus in Henderson Monday, May 11, 2020, as part of a study of convalescent plasma for treating COVID-19. (K.M. Cannon/Las Vegas Review-Journal) @KMCannonPhoto