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Carlos Medina (foreground), a phlebotomist with Bay Area Phlebotomy and Laboratory Services, is assisted with a patient blood draw by Susanna Lee, a second-year UCSF School of Pharmacy student. Over four days in Bolinas, Calif., researchers are collecting samples using nasal swabs for diagnostic tests of active COVID-19 infection and finger-prick blood samples for antibody testing. Photo by Barbara Ries