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I am curious if there is established practice of using Pfizer as a booster dose if a 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.

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  • 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.
    – Bryan Krause
    Commented Aug 30, 2021 at 14:58
  • @BryanKrause Have you (or john or anyone else) learned anything that could shed light on this question during the last four months? Commented Dec 23, 2021 at 2:19

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