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FILE - In this July 22, 2021, file photo, health care worker fills a syringe with the Pfizer COVID-19 vaccine at the American Museum of Natural History in New York. U.S. health officials Wednesday, Aug. 18, recommended all Americans get COVID-19 booster shots to shore up their protection amid the surging delta variant and evidence that the vaccines' effectiveness is falling. (AP Photo/Mary Altaffer, File)

Study shows boosters are less than 20% less effective

A new study from Italian researchers find that COVID booster vaccines are less than 20 percent effective in combating the virus. The recent study also found that vaccines are less than 25 percent effective against symptomatic disease after only a few months.