Polio, once a worldwide scourge, is endemic in just three countries now - Afghanistan, Nigeria and Pakistan. Pictured here is Ameena, a Pakistani girl participating in an anti-polio campaign, showing her ink-marked finger after being vaccinated for polio in Rawalpindi, Pakistan, Monday, October 7, 2013.
Fighting Polio in Pakistan —
Polio, once a worldwide scourge, is endemic in just three countries now - Afghanistan, Nigeria and Pakistan. Pictured here is Ameena, a Pakistani girl participating in an anti-polio campaign, showing her ink-marked finger after being vaccinated for polio in Rawalpindi, Pakistan, Monday, October 7, 2013.
B.K. Bangash/AP Photo
A Pakistani child receives an oral polio vaccine during an anti-polio campaign in Rawalpindi on October 1, 2013. The Polio virus saw a huge surge in year 2011, with as many as 198 cases reported from different parts of the country, forcing the government to enhance the immunization in affected regions.
Fighting Polio in Pakistan —
A Pakistani child receives an oral polio vaccine during an anti-polio campaign in Rawalpindi on October 1, 2013. The Polio virus saw a huge surge in year 2011, with as many as 198 cases reported from different parts of the country, forcing the government to enhance the immunization in affected regions.
FAROOQ NAEEM/AFP/Getty Images
Efforts to stamp out the crippling disease have been hampered by resistance from the Taliban, who have banned vaccination teams from some areas. A Pakistani policeman stands guard as a polio vaccination worker marks a child after immunization with anti-polio drops an infant in Lahore on December 21, 2012.
Fighting Polio in Pakistan —
Efforts to stamp out the crippling disease have been hampered by resistance from the Taliban, who have banned vaccination teams from some areas. A Pakistani policeman stands guard as a polio vaccination worker marks a child after immunization with anti-polio drops an infant in Lahore on December 21, 2012.
Arif Ali/AFP/Getty Images
People attend funeral prayers for victims of an explosion in Peshawar, Pakistan, Monday, October 7, 2013. A bomb exploded next to a van carrying Pakistani security guards tasked with protecting workers involved in an anti-polio drive in the country's northwest on Monday.
Fighting Polio in Pakistan —
People attend funeral prayers for victims of an explosion in Peshawar, Pakistan, Monday, October 7, 2013. A bomb exploded next to a van carrying Pakistani security guards tasked with protecting workers involved in an anti-polio drive in the country's northwest on Monday.
Mohammad Sajjad/AP Photo
Pakistani polio vaccination workers carry placards during a protest against the killing of their colleagues in Lahore on December 21, 2012.
Fighting Polio in Pakistan —
Pakistani polio vaccination workers carry placards during a protest against the killing of their colleagues in Lahore on December 21, 2012.
Arif Ali/AFP/Getty Images
Pakistani relatives mourn the killing of a female polio health worker at a hospital following an attack by gunmen in Peshawar on May 28, 2013.
Fighting Polio in Pakistan —
Pakistani relatives mourn the killing of a female polio health worker at a hospital following an attack by gunmen in Peshawar on May 28, 2013.
A. MAJEED/AFP/Getty Images
Pakistani polio vaccination workers shout slogans against the killing of their colleagues during a protest in Karachi on December 19, 2012. The violence prompted UNICEF and WHO to suspend work on a campaign opposed by the Taliban.
Fighting Polio in Pakistan —
Pakistani polio vaccination workers shout slogans against the killing of their colleagues during a protest in Karachi on December 19, 2012. The violence prompted UNICEF and WHO to suspend work on a campaign opposed by the Taliban.
RIZWAN TABASSUM/AFP/Getty Images
A Pakistani health worker stands in front of a banner at a polio vaccination stall, set up at a bus station, in Rawalpindi on May 31, 2013. The Pakistani Taliban in 2012 banned polio vaccinations in the tribal region of Waziristan, alleging the campaign was a cover for espionage.
Fighting Polio in Pakistan —
A Pakistani health worker stands in front of a banner at a polio vaccination stall, set up at a bus station, in Rawalpindi on May 31, 2013. The Pakistani Taliban in 2012 banned polio vaccinations in the tribal region of Waziristan, alleging the campaign was a cover for espionage.
FAROOQ NAEEM/AFP/Getty Images
Former Pakistani cricket captain Shahid Afridi chats with a polio-afflicted child during a 'Make A Wish' event in Karachi 18 June, 2011.
Fighting Polio in Pakistan —
Former Pakistani cricket captain Shahid Afridi chats with a polio-afflicted child during a 'Make A Wish' event in Karachi 18 June, 2011.
RIZWAN TABASSUM/AFP/Getty Images