The research adds to growing evidence that two doses of the existing Covid shots appear to offer little protection against mild illness.
The effectiveness of the first two doses of the Moderna vaccine saw a similar reduction, falling to about 15 percent from about 71 percent over the same time period.of either the Pfizer or the Moderna vaccine increased the protection back to levels seen after two doses, before starting to wane again after about two months, according to the researchers.
The findings underscore the importance of the booster shot, the study authors wrote, adding that third doses provide a “rapid and substantial” increase in protection against both mild and severe illness.
And those who have received three doses “still have pretty substantial protection” against symptomatic illness, Moore said. Other studies have also found that the vaccines may be inadequate for preventing omicron infections, though people who’ve received three doses appear to have the highest protection. Additionally, studies show, two doses of a vaccine should still provide high protection against severe illness, hospitalization and death.
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