The World Health Organization said it was “confident” that a giant polio vaccination drive in Gaza had hit its target of reaching more than 90 percent of children under 10, AFP reports.

“We are confident that we probably reached the target,” Rik Peeperkorn, the WHO’s representative for the Palestinian territories, told reporters on the final day of the first phase of the campaign aiming to provide hundreds of thousands of children with a first dose of the vaccine.