Les risques d'épidémisation urbaine de la fièvre jaune au Brésil par les vecteurs de la dengue: Aedes aegypti et Aedes albopictus
Rosa, Amélia Paes de Andrade Travassos da
Vasconcelos, Pedro Fernando da Costa
Urban yellow fever (YF) epidemics have disappearedfrom Brazil since about 50 years, but a selvatic cycle still exist. In many States, cases are more or less numerous each year. Ae. aegypti was eradicated in 1954, re-appeared temporarily in 1967, and then definitively in 1976-1977. Ae. aegypti is a vector of yellow few (YF), but also of dengue, whose first cases were reported in 1982. Today, dengue is endemic in many regions. A second Flavivirus vector, Aedes albopictus is present since about ten years in some States, from which São Paulo. The analysis of lhe YF cases between 1972 and 1994 allowed us to determine lhe epidemiologic regions. In the first region, the endemic area, the YF virus is circulating « silently » among monkeys, and the emergence of human cases is rare. In the second region, the epidemic area, some epizootics occur in a more or less cyclic way, and human cases can be numerous. Nevertheless, these outbreaks are considered « selvatic » epidemics, as long as Ae. aegypti is not concemed. From lhe Amazonian region, the virus moves forward along the forest galleries of the Amazone tributaries, from North to South. Actually, dengue epidemics appear in quite ali States, and reflect the geographical distribution of Ae. aegypti. Recently, Ae. aegypti was found in the southern parI of the Pará State, in the Carajás region considered to be the source of the main YF epidemics. In another hand, Ae. albopictus is now increasing its distribution area, specially in the suburban zones. The ecology ofthis potential vector, which seems to have a great adaptative capacity, give this vector an intermediate position between the forest galleries, where lhe YF virus circulares, and the agglomerations infested with Ae. aegypti. Since a few years, the possibility of urban YF is threatening Brazil, it is more and more predictable and we must survey very carefully lhe epidemiological situation in some regions of lhe country.
xmlui.dri2xhtml.METS-1.0.item-citationMONDET, B.; ROSA, Amélia Paes de Andrade Travassos da; VASCONCELOS, Pedro Fernanda da Costa. Les risques d'épidémisation urbaine de la fièvre jaune au Brésil par les vecteurs de la dengue: Aedes aegypti et Aedes albopictus. Bulletin de la Société de Pathologie Exotique, v. 89, n. 2, P. 107-114, 1996.
xmlui.dri2xhtml.METS-1.0.item-decsPrimaryFebre Amarela / epidemiologia
Febre Amarela / prevenção & controle
Dengue / epidemiologia
Dengue / prevenção & controle
Reservatórios de Doenças / virologia