AstraZeneca asks the F.D.A. to authorize an antibody treatment to prevent Covid-19.

AstraZeneca said on Tuesday that it had asked the Food and Drug Administration to grant emergency authorization for a long-acting antibody treatment to prevent Covid-19 in people who are at high risk of the disease. If authorized, it would become

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RNA vaccines seem to produce very different antibody levels

Enlarge / A phlebotomist draws blood meant for antibody testing. We’ve tended to treat the RNA-based vaccines from Moderna and Pfizer/BioNTech as functionally equivalent. They take an identical approach to producing immunity and have a very similar set of ingredients.

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