So the UN will reach all children in Gaza – twice

1.6 million vaccine doses. 4,000 aid workers who must reach at least 90 percent of all children. In the world's worst war zone. It's no easy task when UN agencies are now trying to stop polio, which has unexpectedly returned in the Gaza Strip. The stakes are high for the entire region. The virus is not stopped by borders or walls, says Jonathan Crickx at Unicef.