PARIS, Jan 6 —  French Prime Minister Jean Castex said today that France was ready to deploy a fourth Covid-19 vaccination or second booster shot as soon as health authorities gave their green light to such a move.

"When the health authorities will give us the go-ahead, we’ll go for it,” Castex told BFM TV and RMC Radio.

A fourth dose of Covid-19 vaccine boosts antibodies five-fold a week after the shot is administered, Israeli Prime Minister Naftali Bennett said on Tuesday, citing preliminary findings of an Israeli study. — Reuters