Moderna’s updated COVID-19 vaccine was not more effective at preventing COVID-19 infection, according to a new study.
Researchers funded by Moderna analyzed the updated shot, which contains elements of the Wuhan virus strain and the BA.1 strain, in comparison to the old booster, which was only targeted at the Wuhan variant. They recorded more participants contracting COVID-19 in the group who received the updated booster.
Among those who received the updated shot, 11, or 2.5 percent, contracted COVID-19. Among those who received the old booster, 9, or 2.4 percent, tested positive for COVID-19.
In a breakdown of those without prior COVID-19 infection, more participants in the updated booster group got COVID-19—11, or 3.2 percent—than those who received the old booster—5, or 1.9 percent). None of the volunteers who received the updated booster and had prior infection were re-infected. Three participants with natural immunity were re-infected after receiving the old booster, but none displayed symptoms….