Vaccination wars.

Polio rates are rising in Pakistan, the WHO has called the crisis an international public health emergency - vaccination is the only way to stop this. But the Taliban are against vaccination and are targeting health workers. Nelufar Hedayat visits Karachi to visit some of the health workers risking their lives to protect children from polio. She encounters a group of people who are paid £1 a day to go to people's houses and offer the free vaccine. One woman tells how people in her group are regularly gunned down by the Taliban. Another of the health workers has lived with polio since he was three years old and is dedicated to stop the spread of the disease. We follow a 'vaccination run' which aims to vaccinate a quarter of a million children across the city over the course of two days but the people they are trying to help are often hostile and the health workers have to resort to vaccinating children on the street. Later that day they find out that four health workers on the vaccination run have been abducted and shot dead. Some Muslims believe that the polio vaccines are a way of attacking Muslims by the US, UN and Israel in a kind of bio-terror.