Jerusalem: Israel has begun trials of the fourth dose of coronavirus vaccine in what is believed to be the first study of its kind.
The trial began at Sheba Medical Centre, outside Tel Aviv, with 150 medical personnel who received a booster dose in August receiving a fourth shot of the Pfizer/BioNTech vaccine. The staff receiving the additional dose were tested and found to have low antibody levels.
The trial came as Israeli officials have considered rolling out the second tranche of booster shots to its population as the country grapples with rising infections with the new omicron variant.