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.

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 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.

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

Farida bolach, a female social mobilizer of UNICEF implementing partner conducts a polio awareness session in Government girls school in Kharotabad in Quetta, the capital of Baluchistan province, Pakistan. Photographer: Asad Zaidi

Social mobilizer team of UNICEF implementing partner conducts a polio awareness session with the nomads in Aghbarg neighborhood of Quetta, the capital of Baluchistan province, Pakistan. Photographer: Asad Zaidi

Mohammad Nafees 32, a polio affected man working as a volunteer with a social mobilizer team of UNICEF implementing partner in village Dadhaqzai, district Pishin, Baluchistan province, Pakistan.

Abdul latif and Ashrat , polio team reached into the flooded village Bhano goth in UC Therhi, Kharpur district of Sindh province in Pakistan.

Ashrat a health worker after vaccinates a child against polio putting an identification ink mark on a child's little finger in flooded village Bhano goth in UC Therhi, Kharpur district of Sindh province in Pakistan.

A health worker vaccinates a child against polio in a flooded village Sain Dad Katohar in UC UC Shadi shaheed, Kharpur district of Sindh province in Pakistan.

Polio teams crossed Indus river on a boat to vaccinate young children in village shah Nawaz, UC Mirzapur, Shikarpur district of Sindh province in Pakistan.

Polio teams crossed Indus river on a boat to vaccinate young children in village shah Nawaz, UC Mirzapur, Shikarpur district of Sindh province in Pakistan.

Kashif (right) and Zabair, polio team walks through flood water in UC Lodra Bagi, Shikarpur district of Sindh province in Pakistan.

Pakistani women with their children waits outside an EPI center in National Institute of Child Health, Karachi Pakistan. during Polio Ð National Immunisation Day (NID) in Pakistan.

A health worker after vaccinates a child in EPI center in National Institute of Child Health, Karachi Pakistan. During Polio Ð National Immunisation Day (NID) in Pakistan.

All TMA vehicles have displayed polio banners and poster during Polio – National Immunisation Day (NID) in Landhi town, Karachi Pakistan.

A health worker looks for children under five years in local buses in Landhi town, Karachi Pakistan.

A health worker after vaccinates a child against polio putting an identification ink mark on a child's little finger during Polio Ð National Immunisation Day (NID), while her mother watching in Sherpow in Landhi town, Karachi Pakistan.

A health worker vaccinates a child against polio outside her home during Polio Ð National Immunisation Day (NID, while her sisters watching in Sherpow in Landhi town, Karachi Pakistan.

During door-to-door national polio campaign a polio team outreach in a camp for flood-affected people during Polio Ð National Immunisation Day (NID), while her mother making food and his brother and sisters watching in Bin Qasim town in Karachi Pakistan.

During door-to-door national polio campaign a polio team outreach in a camp for flood-affected people during Polio Ð National Immunisation Day (NID), while her mother making food and his brother and sisters watching in Bin Qasim town in Karachi Pakistan.

A family vaccinates their child against polio at railway station before leaving Karachi during Polio Ð National Immunisation Day (NID) at cant railway station in Karachi Pakistan.

A health worker vaccinates a child from hindu community (marginalized community in Pakistani society) against polio, in-front of their holly place (where they gather to worship) in her home during Polio Ð National Immunisation Day (NID) in Bhakar Niger in Gulshan-e-Iqbal town, Karachi Pakistan.

A health worker vaccinates a child from hindu community (marginalized community in Pakistani society) against polio, in-front of their holly place (where they gather to worship) in her home during Polio Ð National Immunisation Day (NID) in Bhakar Niger in Gulshan-e-Iqbal town, Karachi Pakistan.

Sidra Sajjad sitting on her wheelchair while her younger sister and cousin playing in her house in Delhi gate society in Multan city of Punjab district of Pakistan. Sidra Sajjad 17 years old diagnosed with polio when she was less than a year old her both legs completely paralysed. Undaunted, his parents - a humble family of limited means – tried to do the treatment of their daughter but could not succeed. Sidra said, “I keep thinking about polio why this happened to me It always very painful for me to see my cousin running around me and I could not do that If I were not a polio patient I would play like my cousins. I know all the suffering of polio that’s why I would like to give a message to all the parents must vaccinate your under five children against polio”.

EPI workers transport cold boxes of polio vaccine on boats to the distribution point at Bath Island in Karachi district of Sindh province in Pakistan.

PI workers transport cold boxes of polio vaccine to the MCH center at Bath Island in Karachi district of Sindh province in Pakistan.

Young volunteers girls came to collect polio vaccine from MCH center Bath Island in Karachi district of Sindh province in Pakistan.

A health worker after vaccinates all the children under five in a household mark the house to show it has been covered during Polio – National Immunisation Day (NID) Baba Island in Karachi district of Sindh province in Pakistan.

Young volunteers girls and EPI workers reached at Baba Island by boats for door-to-door national polio campaign after collecting polio vaccine from MCH center at Bath Island in Karachi district of Sindh province in Pakistan.

Young volunteers girls and EPI workers reached at Baba Island by boats for door-to-door national polio campaign after collecting polio vaccine from MCH center at Bath Island in Karachi district of Sindh province in Pakistan.

An EPI workers transport polio vaccine on 4x4 jeep during door-to-door national polio campaign a polio team outreach in Kamber Shehzad kot in Sindh province in Pakistan.