 Joe English is a spokesperson for UNICEF. It is needed. We need to make sure that water and sanitation infrastructure, which has come under attack again and again, is rebuilt. He says there hasn't been a polio case in Gaza in more than a decade. Before the conflict started late last year, polio vaccination levels were at 99% in the Gaza Strip. It's now at 89%. Gabriela Emanuel, NPR News. And you're listening to NPR News.