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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 recently 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.

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