March 16, 2021

88% of Americans who received first dose of Pfizer, Moderna COVID-19 vaccines have also completed second dose, CDC study shows

(Reuters) - Vaccination of about 88% of Americans who received the first dose of Pfizer/BioNTech or Moderna’s COVID-19 vaccines was complete, a study of over 12 million people by the U.S. Centers for Disease Control and Prevention (CDC) showed.

Both vaccines, among the firsts to receive U.S. emergency use authorization, require two shots. The vaccines’ high efficacy is based on trials with interval between the shots of 21 days for Pfizer Inc/BioNTech SE and 28 days for and Moderna Inc’s vaccine.

According to the analysis, about 3% of people in the United States who received the first dose of either of the vaccines did not get the second dose needed to complete vaccination, the agency said on Monday. Read more.