![]() ![]() Read More: How America Lost the COVID-19 War This drop in efficacy corresponded to rates of lab-confirmed positive tests for Delta and Omicron infections. This waning was greater during the Omicron wave than during the Delta wave, suggesting that the vaccine was less effective against Omicron.īooster doses after the primary series restored protection back to levels achieved just after the primary vaccination, but this protection waned too, at a rate similar to that after the primary series, dropping from 60% at one month after the booster dose to 13% at nine months. ![]() ![]() (There were differences among the vaccines, with Moderna’s primary series of two shots showing the highest effectiveness of 62% one month after the series, and Sinovac’s demonstrating the lowest effectiveness at 32%.) After six months, the overall effectiveness of the vaccines dropped further to 14%, and to 9% after six months. Overall, the researchers found that one month after people received two doses of either mRNA vaccine (from Moderna or Pfizer-BioNTech), the vaccine from AstraZeneca, or the shot from Sinovac, the vaccine effectiveness was 53% in protecting against symptoms of COVID-19. ![]()
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