Arathrael
Pro-Bowler
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Israel is giving fourth doses out to over-60s - https://www.bbc.co.uk/news/world-middle-east-59749967 .
It's not clear why. The article there mentions that "The BBC's Tom Bateman in Jerusalem says the evidence favouring a fourth shot has not yet been released, and the same committee advised against the move only a week ago." I'd guess the implication is that they're either seeing waning effects after a third dose in that age group, or that a fourth dose provides even better protection than a third dose in that age group so they think it's worth it, or even that they're just guessing it might, but without the evidence it's hard to say.
It's not clear why. The article there mentions that "The BBC's Tom Bateman in Jerusalem says the evidence favouring a fourth shot has not yet been released, and the same committee advised against the move only a week ago." I'd guess the implication is that they're either seeing waning effects after a third dose in that age group, or that a fourth dose provides even better protection than a third dose in that age group so they think it's worth it, or even that they're just guessing it might, but without the evidence it's hard to say.