An outbreak of mosquito-borne encephalitis B has killed 17 people in a city in northern China, the government announced Friday. Health experts were taking «urgent measures» to stop the spread of the disease in Yuncheng, a city in Shanxi province, the official Xinhua News Agency said, citing local officials. It said 17 people in Yuncheng have died over the past two weeks of encephalitis B, a disease that causes an inflammation of the brain.