Imported African trypanosomiasis in the United States.

Since 1967, six cases of African trypanosomiasis have been diagnosed and treated in the United States. Five patients were Americans infected with Trypanosoma rhodesiense, and the other was an African student with T. gambiense. Presenting signs and symptoms for all cases were typical of the disease, but often the diagnosis was delayed. The five Americans had spent only brief periods in endemic areas. All cases responded to therapy although one relapsed. Cases of imported sleeping sickness are few, and the risk of Americans acquiring the disease while traveling to endemic areas is low. However, the early diagnosis of sleeping sickness requires that physicians be cognizant of the possibility of imported tropical diseases.