AstraZeneca starts 30K-subject U.S. phase 3 COVID-19 vaccine trial
AstraZeneca has begun a U.S. phase 3 clinical trial of its COVID-19 vaccine candidate AZD1222. The Biomedical Advanced Research and Development Authority-funded study will enroll 30,000 adults at sites in the U.S. and some other countries in which the virus is prevalent.