A very brief guide to mixing boosters, in descending order of antibodies:

3 shots of Moderna = Best

Pfizer → Moderna = Next best

Moderna → Pfizer = Also very good!

J&J → Moderna = Do it

J&J → Pfizer = Yes

J&J → J&J = Get Moderna or Pfizer instead

https://www.theatlantic.com/health/archive/2021/10/mix-match-booster-covid-vaccine/620395

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Wtf