Adults are more likely to report mild and moderate side-effects after mixing doses of the AstraZeneca and Pfizer Covid vaccines, a study indicates. Chills, headaches and muscle pain were reported more frequently when different vaccine doses were combined. Any adverse reactions were short lived, with no other safety concerns. “It’s a really intriguing finding and not something we were necessarily expecting,” Prof Matthew Snape, from the Oxford Vaccine Group said.
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