Covid News: Pfizer and BioNTech Are Developing a Vaccine That Targets Delta Variant

Covid News: Pfizer and BioNTech Are Developing a Vaccine That Targets Delta Variant

Here’s what you need to know: Medical staff prepare a dose of the Pfizer BioNTech vaccine in Sant Vicenc de Casteller, north of Barcelona, this month.Credit…Albert Gea/Reuters Pfizer and BioNTech announced …

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