KARACHI: July 20 - A health worker administers polio vaccine drops to a child during a polio vaccination door-to-door campaign at Nazimabad. APP Photo by M Saeed Qureshi - Associated Press of Pakistan

KARACHI: July 20 - A health worker administers polio vaccine drops to a child during a polio vaccination door-to-door campaign at Nazimabad. APP Photo by M Saeed Qureshi  Associated Press of Pakistan