The original vaccines still offer good protection against severe illness and death. Studies in the U.S. and elsewhere have made clear that adding a booster dose strengthens that protection and improves the chances of avoiding a milder infection.
“We recognize the need to be prepared in the event this protection wanes over time and to potentially help address omicron and new variants in the future,” Kathrin Jansen, Pfizer’s vaccine research chief, said in a statement. The new U.S. study is enrolling up to 1,420 healthy adults, ages 18 to 55, to test the updated omicron-based shots for use as a booster or for primary vaccinations. Researchers will examine the tweaked vaccine’s safety and how it revs up the immune system in comparison to the original shots.
In one study group, about 600 volunteers who received two doses of the current Pfizer vaccine three to six months ago will receive either one or two omicron-based shots as boosters. Another 600 who’ve already gotten three regular doses of the Pfizer vaccine will be given a fourth dose of either the regular vaccine or the omicron-matched version.
The study also will enroll some unvaccinated volunteers who will receive three doses of the omicron-based vaccine.The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.
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