Many people ineligible for the booster because they did not get Pfizer are wondering if they can mix the brands for their booster.
The FDA is currently discussing that possibility.
A study recently released showed the Moderna boosters mixed with Johnson & Johnson showed stronger immunity.
Related: If someone was already infected with COVID-19, do they have enough antibodies to not need the vaccine?
Moderna’s vaccine with its own booster had the strongest immunity out of all combinations.