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Fourth Covid-19 vaccine shot raises resistance to serious illness for over-60s: Israel
A preliminary study published by Israel's Sheba medical centre last Monday found that the fourth shot increases antibodies to even higher levels than the third but "probably" not to the point that it could completely fend off the highly transmissible Omicron variant.
Thailand rolls out fourth Covid shot in popular tourist spots
Meanwhile, Thailand is also getting started on its fourth shots for residents in its popular tourism-dependent states.