The challenge is immense: housing, food, medical treatment, crime prevention, and sanitation are just the basics. The camp, which is overseen jointly by the government of Jordan and the United Nations refugee agency, covers two square miles, with 27,101 shelters and 1,724 infrastructure or support buildings, according to a UN map of the camp made in July. Diabetes and hypertension are the top two chronic health conditions in the camp. The UN is also tracking diseases with epidemic potential. In July 2013, the UN reported a high risk of outbreaks of watery diarrhea and acute jaundice syndrome.