A young girl shows ink mark on her finger, which confirms that she has received polio vaccine during Sehat Ka Ittehad campaign, in Peshawar city, Khyber-Pakhtunkhwa Province, Pakistan. Photographer: Asad Zaidi.

A polio worker after vaccinates a child putting an identification ink mark on his little finger at the entrance of FATA during Sehat Ka Ittehad campaign, in Peshawar city, Khyber-Pakhtunkhwa Province, Pakistan. Photographer: Asad Zaidi.

Zafar Khan, a social mobilizer of UNICEF implementing partner conducts a polio awareness session with community elders in Kharotabad in Quetta, the capital of Baluchistan province, Pakistan.

Zafar Khan and Shahpur Saleem (left to right) comm net team of UNICEF implementing partner gives a fatwa book and other UNICEF polio awareness metrical to the Imam Masjid (Mosque in charge) in Kharotabad in Quetta, the capital of Baluchistan province, Pakistan.

Young boys holds polio awareness flyer during a polio awareness session in Iqra humdard public school in Samungli Road Quetta, the capital of Baluchistan province, Pakistan. Photographer: Asad Zaidi

Zafar Khan, a social mobilizer of UNICEF implementing partner conducts a polio awareness session in Iqra humdard public school in Samungli Road Quetta, the capital of Baluchistan province, Pakistan. Photographer: Asad Zaidi