A study quantifies how much vaccine protection drops over time and makes a case for boosters
hether you get it from a vaccine or an infection, COVID-19 immunity does not last forever. In a, researchers combed through studies to determine just how long protection from the shots endures.
Overall, the researchers found that one month after people received two doses of either mRNA vaccine , the vaccine from AstraZeneca, or the shot from Sinovac, the vaccine effectiveness was 53% in protecting against symptoms of COVID-19. After six months, the overall effectiveness of the vaccines dropped further to 14%, and to 9% after six months. This waning was greater during the Omicron wave than during the Delta wave, suggesting that the vaccine was less effective against Omicron.
“This study is showing that the protection [from vaccines] is very high at the beginning, but it wanes quickly,” says Marco Ajelli, associate professor of epidemiology and biostatistics at the Indiana University School of Public Health and one of the co-authors of the study. “That’s exactly in line with what we observe for influenza.”
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