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Considérations sur l'épidémiologie de la fièvre jaune au Brésil

Publication Date
  • Fievre Jaune
  • Virus
  • Epidemiologie
  • Repartition Geographique
  • Variation Spatiale
  • Variation Temporelle
  • Histoire
  • Foyer Endemique
  • Cartographie Sanitaire
  • Modele De Propagatoin
  • Biology
  • Medicine


Considérations sur l'épidémiologie de la fièvre jaune au Brésil Epidémiologie 260 Considérations sur l’épidémiologie de la fièvre jaune au Brésil. Summary: Yellow fever epidemiology in Brazil – new considerations. We have carried out a meticulous time-space analysis of the incidence of yellow fever in humans in Brazil from 1954 to 1972 and especially from 1973 to 1999. This study has added to our knowledge of the epidemiology of yellow fever and enabled us to redefine epidemiological zones and determine their geographical limits. The ende - mic area is located within the Amazon basin; here cases are scattered and generally limited in number. However, there are also “foci of endemic emergence” within this area, where cases are less rare, although occurrence remains irregular. The epidemic area is for the most part situated outside the Amazon basin, to the north east and particularly to the south. It has been divided into two parts according to whether the occurrence of yellow fever is cyclic or sporadic. The epidemics, which are all sylvatic, follow either a circular path (in the forest area) or a linear path (in forest-galleries of the savannah area). The study of the development of the 3 main epidemics (1972-74; 1979-82; 1986-92) in the cyclic emergence area showed that, on each occasion, the yellow fever virus appeared at a particularly active outbreak site located in the “serra dos Carajás”, and from there, it followed the courses of the Tocantins and Araguaia rivers upstream, moving southwards during the “pre-epidemic phase” which may be visible due to the occurrence of a few cases, or may remain invisible. Subsequently the virus rea - ched the emergence area, where it appeared in the form of epidemics. In this zone, it also followed privileged south-western pathways, moving from one hydraulic basin to another along the upstream courses of the rivers. Almost exactly the same pathways have been identified for each of the 3 epidemics studied. The distances tra - velled by the v

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