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A third dose of COVID-19 vaccine: People who are moderately to severely immunocompromised

Posted on: September 15, 2021

Some people do not develop a strong immune response from two doses of vaccine because of the use of certain medications and treatments, as well as some health conditions. For this group, it takes an additional dose to have a reasonable level of immunity and protection against COVID-19. This page explores who is eligible for a 3rd dose, how to get a 3rd dose and the difference between a 3rd dose and booster shot.  

CDC

3rd dose of COVID-19 vaccine