Pfizer-BioNTech testing booster of their Covid-19 vaccine in new trial

Pfizer Inc and BioNTech SE said on Thursday they are testing a third dose of their Covid-19 vaccine to better understand the immune response against new variants of the virus. They are also in talks with regulatory authorities about testing a vaccine modified to protect specifically against the highly transmissible new variant found in South Africa and elsewhere, known as B.1.351, as a second arm of the same study.
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