In early 2021, both Pfizer and Moderna began to offer participants the option to become unblinded and receive the vaccine (13, 14).

How long will it take to build immunity after getting the COVID-19 vaccine?

It takes time for your body to build protection after any vaccination. People are considered fully vaccinated two weeks after their second shot of the Pfizer-BioNtech or Moderna COVID-19 vaccine, or two weeks after the single-dose J&J/Janssen COVID-19 vaccine.

Is the Pfizer-BioNTech COVID-19 vaccine authorized?

Pfizer-BioNTech COVID-19 Vaccine is authorized to prevent coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals 16 years of age and older.