Third shots of the coronavirus vaccines become significantly less likely to protect against serious illness after about four months, according to a new study released Friday.
The effectiveness of the third booster doses against hospitalizations during the Omicron era of the pandemic dropped from 91 percent in the first two months after a third dose to 78 percent around the fourth month, data from the Centers for Disease Control and Prevention suggest.
Effectiveness against emergency department or urgent care visits in that same period went from 87 percent in two months to 66 percent by the fourth month after the third dose – and only 37 percent after about five months, the data show.
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