Pfizer-BioNTech’s vaccine gets slightly weaker over time, company data shows, but remains strong in preventing severe disease.
By BY CARL ZIMMER AND SHARON LAFRANIERE from NYT Health https://ift.tt/3iZpVX4
Pfizer-BioNTech’s vaccine gets slightly weaker over time, company data shows, but remains strong in preventing severe disease.
Reviewed by Virual stuff
on
July 28, 2021
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