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Pfizer vaccine after AstraZeneca dose is highly safe and effective, Spanish study finds

A Spanish study on mixing Covid vaccines has found that giving a dose of Pfizer’s drug to people who already received a first shot of AstraZeneca vaccine is highly safe and effective, , preliminary data showed on Tuesday. The Combivacs study, run by Spain’s state-backed Carlos III Health Institute, found the presence of IgG antibodies […]