U.S. and European Union authorities are considering whether booster shots are needed for specific risk groups.
Since the Delta variant began spreading in Israel in June, the health ministry has twice reported a drop in the vaccine's effectiveness against infection and a slight decrease in its protection against severe disease. A decision should be made in the coming weeks, Ash said, and it would likely affect people either 60- or 70-years-old and up, the high-risk group first to get the jab when Israel began its vaccination drive in December.Some experts said Israel should wait a little longer to receive more information about safety and effectiveness of a third shot.
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