A new medical study from South Korea says that a shot of AstraZeneca's coronavirus vaccine followed by a shot of the Pfizer-BioNTech vaccine can boost some antibody levels by six times compared to using just two shots of AstraZeneca instead https://t.co/Ob3iyTx4d5 pic.twitter.com/eVelUocgyw— Reuters (@Reuters) July 26, 2021
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