A fourth COVID-19 vaccine dose given to those aged over 60 made them three times more resistant to serious illness than those who received three shots, a study released by Israel’s Health Ministry on Sunday found.The fourth dose, or second booster, also made older adults twice as resistant to infection than the thrice-vaccinated people in the same age group, the study said.The research compared data from about 400,000 people over 60 who received the second booster with 600,000 people in the same age group who were given a third shot four months earlier.
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