The city of Peshawar, in northwestern Pakistan, is a hotspot for the crippling virus.
![Threats of violence often disrupt polio vaccination efforts in Pakistan [AFP/Getty Images]](https://www.aljazeera.com/wp-content/uploads/2014/02/201426125348521734_20.jpeg?resize=270%2C180&quality=80)
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Thirty-one people have been killed in attacks on health workers since July 2012.
![Those attacking polio workers claim they are spies or that the vaccination will make Muslim children sterile [AP]](https://www.aljazeera.com/wp-content/uploads/2013/12/2013121671034533734_20.jpeg?resize=270%2C180&quality=80)
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The city of Peshawar, in northwestern Pakistan, is a hotspot for the crippling virus.
Thirty-one people have been killed in attacks on health workers since July 2012.