PESHAWAR, Pakistan - Gunmen killed a female polio worker and injured another near the northwest city of Peshawar on Tuesday, the latest in a series of assaults on vaccination teams working to eradicate the disease in Pakistan.
Quote:As of 2012, polio remains endemic in only three countries: Nigeria, Pakistan, and Afghanistan, although it continues to cause epidemics in other nearby countries due to hidden or reestablished transmission. For example, despite eradication ten years prior, an outbreak was confirmed in China in September 2011 involving a strain prevalent in neighboring Pakistan.