The effectiveness of COVID-19 vaccines produced by Pfizer/BioNTech, Moderna, and Johnson & Johnson dropped dramatically as the Delta variant swept the United States, a study of almost 800,000 veterans found.
Meanwhile, the Pfizer/BioNTech vaccine went from being 87% effective to 45% effective over the same time period.
The Johnson & Johnson vaccine showed the biggest drop -- from 86% effectiveness to 13% over those 6 months.-CoV-2 infection, protection waned as the Delta variant emerged in the U.S., and this decline did not differ by age,” the study said. The three vaccines also lost effectiveness in the ability to protect against death in veterans 65 and over after only 3 months, theCompared to unvaccinated veterans in that age group, veterans who got the Moderna vaccine and had a breakthrough case were 76% less likely to die of COVID-19 by July.
The protection was 70% for Pfizer/BioNTech vaccine recipients and 52% for J&J vaccine recipients for the same age group, compared to unvaccinated veterans, according to the newspaper. For veterans under 65, the protectiveness against a fatal case of COVID was 84% for Pfizer/BioNTech recipients, 82% for Moderna recipients, and 73% for J&J recipients, compared to unvaccinated veterans in that age group.
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