Therese Raphael, Columnist

Meet the Non-Vaccines That Promise to Boost Covid Immunity

AstraZeneca could have the first long-acting preventative treatment for Covid-19. For some patient groups, that would be a game-changer.

August 27, 2021 at 5:30 AM UTC

By Therese Raphael

Therese Raphael is a columnist for Bloomberg Opinion covering health care and British politics. Previously, she was editorial page editor of the Wall Street Journal Europe.

Here’s a boost.
Photographer: Saeed Khan/AFP

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Vaccines never promised us perfect protection. Yet studies are showing that our defenses are declining faster than expected.

One from Oxford University published last week showed that the efficacy of the BioNTech/Pfizer Inc. vaccine was halved after four months. Another, published Tuesday by the U.S. Centers for Disease Control, reported that since the delta variant became predominant, the efficacy of mRNA vaccines against infection decreased to 66% from 91% among front-line workers.