Natural History of Leishtnania (Leishmania) chagasi infection in Northeastern Brazil: Long-Term Follow-Up.

Discusses the natural history of Leishmania chagasi infection, or Leishmaniasis, in a cohort of persons in Ceara in northeastern Brazil. Decrease in the incidence of visceral leishmaniasis; Effect of differences in rainfall, vector density and herd immunity; Possibility that L. chagasi infection is not likely to progress to visceral leishmaniasis if it has not done so within the first or second year after infection.