I am curious if there is established practice of using pfizer as booster if person was vaccinated with sinopharm. One example I think is here which says it is possible https://www.timeoutdubai.com/news/471688-covid-19-vaccine-booster-uae-everything-you-need-to-know

But I am curious about wider experience.

  • Combinations of boosters of different vaccines has not been tested; there's a combinatorial problem of studying all the different possible permutations. Even boosters more generally have only had limited study. Aug 30 at 14:58

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