Mixing Covid vaccine doses safe, more effective: Study
A Spanish study on mixing Covid-19 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 results showed on Tuesday.
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A Spanish study on mixing Covid-19 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 results showed on Tuesday. 
