An increasing number of Americans have missed their second dose of a COVID-19 vaccine, suggest data from the US Centers for Disease Control and Prevention.

The Pfizer/BioNTech and Moderna COVID-19 vaccines require two doses, to be given at a gap of three and four weeks, respectively, to be considered fully effective. However, data indicate that nearly 8% of Americans have missed their second dose, rising from about 3.4% in March.

However, this is not an exact count. If a person received the two doses from different reporting entities, the two doses may not have been linked together, stated a CDC spokesperson. If an individual received the first dose at a state-run clinic, and the second dose at a tribal health clinic, they might not be linked and it could reflect as the second dose was missed… (CNN, April 25, 2021)