Mix & match of Covid-19 shots not a good idea

Is one shot of the Covid-19 vaccine sufficient to protect one from infection? If not, is it okay to take one shot of the vaccine available now and wait for a more effective vaccine to be available for the second jab? For the first time, the US FDA has clear answers to these common queries. It has stated, with respect to the Pfizer-BioNTech and Moderna vaccines being administered in that country, that the answers to the two questions would both be ‘No’.

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