A health worker administers polio vaccine drops to a child during a door-to-door polio campaign in Karachi. Rizwan Tabassum / AFP
A health worker administers polio vaccine drops to a child during a door-to-door polio campaign in Karachi. Rizwan Tabassum / AFP

Bill Gates: The UAE is a powerful ally in the fight to eradicate diseases that afflict the world's poorest people