Left to right: Alexis Mukwedi tested positive for sleeping sickness in the Democratic Republic of the Congo. A sandfly, whose bite can spread the parasite causing visceral leishmaniasis, lands on the photographer for a blood meal. A woman in Vietnam receives an eye exam to see if she has trachoma, which can cause blindness. Last year several countries eliminated the threat from this disease. Xavier Vaheed-DNDi, James Gathany/CDC, AFP via Getty Images hide caption
