Health experts have questioned the reliability of the Centers for Disease Control and Prevention (CDC) tracker documenting the number of U.S. residents immunized against COVID by age, location and type of vaccine. 

Questions have been raised following discrepancies between state dashboards and CDC data.  Dr. Howard Forman of the Yale University School of Medicine stated, “I am not sure how reliable the CDC numbers are since you want to know the best data to plan and prepare and know where to put resources in place especially in areas that are grossly under vaccinated.”

The CDC does however note problems in obtaining accurate data since residents may be vaccinated in a jurisdiction other than their home county or state and difficulties have arisen in reporting centering on confidentiality. Laws and policies differ widely among states contributing data to the CDC.