The question of a fourth dose comes as studies show the effectiveness of two vaccine shots followed by a booster wanes over time. The U.S. Centers for Disease Control and Prevention has said the booster’s effectiveness against hospitalization drops from 91% to 78% four months after it is given. Pfizer CEO Dr. Albert Bourla said Pfizer is submitting data to the FDA, and a ruling from that agency on whether a fourth shot will be approved for the general public will be made. Experts on Long Island said they do not see a need for a fourth vaccine shot now, and it is hard to predict whether one will be necessary in the immediate future. They expect some kind of yearly ward off COVID-19 vaccine off . . .