The Collaborative International Dictionary of English v.0.48:

Chagas' disease \Chagas' disease\ n. [Carlos Chagas, a physician
   in Brazil, 1879-1934]
   a form of trypanosomiasis caused by infection with
   Trypamosoma cruzi, found principally in South America. It
   is transmitted by certain species of reduviid bugs, and has
   natural reservoirs in dogs, armadillos, rodents and other
   domestic and wild mammals. --Stedman's Med. Dict.,
   --Dorland's Illustr. Med. Dict.

   Syn: South Amercian trypanosomiasis, Chagas-Cruz disease.
        [PJC]