Medical students, faculty and volunteers take blood samples during a coronavirus antibody study in Mountain View, Calif., on April 3. Santa Clara County’s medical examiner says a person who died on Feb. 6 has posthumously tested positive for COVID-19.

Santa Clara County’s medical examiner says a person who died on Feb. 6 has posthumously tested positive for COVID-19. Here, medical students, faculty and volunteers take blood samples during a coronavirus antibody study in Mountain View, Calif., earlier this month.