Millions Are Skipping Their Second Doses of Covid-19 Vaccines April 28, 2021 Auto Bot Centers for Disease Control and Prevention, Coronavirus (2019-nCoV), Moderna Inc, Pfizer Inc, United States, Vaccination and Immunization, Walgreen Co 0 Nearly 8 percent of those who got initial Pfizer or Moderna shots missed their second doses. State officials want to prevent the numbers from rising.