Study on the natural history of malaria in areas of the Rondonia State - Brazil and problems related to its control

KEY WORDS: Malaria; Epidemiology; Rondonia State. Studies performed more than forty years ago in the Rondonia State, as well as in other scattered localities in the Amazon Basin indicated that the only important local vector of malaria was Anopheles darlingi -u Since then, huge uncontrolled immigration, mostly from malaria free areas from Northeastern and Southern States, has been stimulated and remarkable change in the environment has occured due to human activity, leading to a marked increase in the incidence of malaria in Brazil, reaching about 500 thousands cases in 1987, more than 40% of the patients being from Rondonia". Y. Recent investigations in another Amazonian State (Para)