A study into vaccine-mixing - which is not policy in the US, but is sometimes used in France, Germany, and the UK - found it was safe but unpleasant.
A healthcare worker in the Netherlands is given the Pfizer-BioNTech vaccine on January 6.
Piroschka van de Wouw/Pool via AP
Mixing the AstraZeneca ...
https://www.businessinsider.com/covid-vaccine-side-effects-worse-when-mixing-vaccines-study-says-2021-5#Insider
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