Re: Coronavirus
A booster is just another dose of vaccine. It might be a vaccine from a different manufacturer, or using a different vector, if that’s proven to prompt a better immune response to the formulation given in the original vaccination. But it is still just a dose of vaccine and is not developed or distributed in any fundamentally different way.
I believe at present with Covid the assumption is that the booster, if given, is just a third dose of whatever the patient has already had, though there is ongoing research looking at the efficacy of mixing manufacturers.
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