A man receives a fourth dose of coronavirus disease (COVID-19) vaccine as part of a trial in Israel, as Health Ministry is considering offering the second booster to the elderly and immunocompromised, at Sheba Medical Center in Ramat Gan, Israel December 27, 2021. REUTERS/Ronen Zvulun Israel is to go ahead with second COVID-19 vaccine booster shots for people with weakened immune systems, the top government health official said on Thursday, but a final decision on wider usage is still pending. An Israeli hospital administered fourth shots to a test group of health workers on Monday, in what it called the...