Israel mulls 3rd virus shot

Study shows antibody levels high after 6 months. Study also indicates that elderly, immunocompromised retained high antibody levels; government weighing new measures amid signs vaccine less effective against Delta variant.

The reports come as Israel has begun debating the need for a third booster shot a spike in cases and signs that the vaccine was slightly less effective against the Delta variant.

The Delta variant, which is believed to be twice as contagious as the original strain of COVID-19, is thought to be responsible for 90% of new cases in Israel over the past two weeks.