One dose of Pfizer or Moderna vaccines was 80% effective in preventing Covid in CDC study of health workers
A single dose ofPfizerorModerna'sCovid-19vaccines was 80% effective in preventing coronavirus infections, according to a new Centers for Disease Control and Prevention study of vaccinated health-care workers.The effectiveness of partial immunization was seen two weeks after the first dose, according to the CDC, which looked at nearly 4,000 health care personnel, first responders and frontline workers between Dec. 14 and March 13. The health care workers in the study, which was published Monday,
