Mixing AstraZeneca and Pfizer vaccines increase side effects, study finds

World | 13 May 2021 9:15 am

Mixing doses of AstraZeneca Plc’s and Pfizer Inc.’s vaccines increased side effects such as fatigue and headaches among patients, researchers at the University of Oxford reported.

People who got a first dose of AstraZeneca's shot followed by Pfizer’s vaccine four weeks later reported more short-lived side effects, most of them mild, researchers from the University of Oxford reported in The Lancet medical journal. That was also true when the order of the shots was switched, Bloomberg reports.



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