You should get the same kind of vaccine for both doses to be fully protected. Experts aren’t sure if the vaccines will work as well if you get two different kinds of vaccines for your primary series. However, if two doses of different COVID-19 vaccines are accidentally given, don’t get a third shot at this time.
If you are 18 years or older and received one type of vaccine for your primary mRNA vaccine series, you are eligible for a booster as long as 6 months have passed since you completed your last dose. The CDC has approved mix and match booster doses for those who are eligible for a booster dose after their primary series. This means that a person can receive a booster of a COVID-19 vaccine that is different than the COVID-19 vaccine they received for their primary series. Please check ourshot.in.gov regularly for updates.