ANSWERS: 3
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For covid? There are currently (22 Mar 2021) three: 1) Pfizer (a.k.a. Bio-N-Tech), 2) Moderna, and 3) Johnson and Johnson (a.k.a. Janssen). There are several more at various stages of development, so if you are signed up for a clinical trial, you'd likely get either a different one or a shot of saline. If not covid, it'd be good to know for what in order to answer the question.
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Pfizer, Moderna and J&J
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I was recently contacted to schedule a covid 19 booster if I want one. 8/29/2021
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