KABUL, Afghanistan – An outbreak of a tropical disease caused by sand fly bites that leaves disfiguring skin sores has hit Afghanistan, with tens of thousands of people infected, health officials said Friday. Cutaneous leishmanisis is a parasitic disease transmitted by the female phlebotomine sand fly — an insect only 2-3 millimeters long that requires the blood of humans or animals so its eggs can develop. Treatable with medication and not life-threatening, cutaneous leishmanisis can leave severe scars on the bodies of victims. The disease threatens 13 million people in Afghanistan, the World Health Organization said, and many impoverished Afghan...