Cumulative Influenza Vaccination Coverage, by Flu Season and Race/Ethnicity, Pregnant Persons 18-49 years • These monthly flu vaccination coverage estimates for pregnant persons are based on electronic health record (EHR) data from the Vaccine Safety Datalink (VSD), a collaboration between CDC’s Immunization Safety Office and nine integrated health care organizations.§ This system has been used annually to estimate vaccination coverage among pregnant persons. COVID-19 vaccination coverage for pregnant persons is available here.