A man who boosted his Pfizer COVID-19 vaccine with a shot from Moderna said his side effects were a 'little more severe' the third time round

A man who boosted his Pfizer COVID-19 vaccine with a shot from Moderna said his side effects were a 'little more severe' the third time round

Business Insider

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Scientists are researching whether mixing and matching COVID-19 shots from Pfizer, Moderna, and Johnson & Johnson is safe and effective.

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