Jennifer Haller is the first of 45 human participants to test a potential vaccine for the novel coronavirus.

First Human Trial for COVID-19 Vaccine Underway
A pharmacist gives Jennifer Haller, left, the first shot in the first-stage safety study clinical trial of a potential vaccine for COVID-19, the disease caused by the new coronavirus, Monday, March 16, 2020, at the Kaiser Permanente Washington Health Research Institute in Seattle. (AP Photo/Ted S. Warren)