Entomological investigation of a sylvatic yellow fever area in São Paulo State, Brazil.

Following reports of two autochthonous cases of sylvatic yellow fever in the State of São Paulo, Brazil, in 2000, entomological surveys were conducted with the objective of verifying the occurrence of vector species in forest environments close to or associated with riparian areas located in the western and northwestern regions of the State. Culicidae were captured in 39 sites distributed in four regions. Haemagogus leucocelaenus and Aedes albopictus were the most abundant species and were captured in all the regions studied. H. leucocelaenus was the most abundant species in the municipalities of Santa Albertina and Ouroeste, where the two cases of sylvatic yellow fever had been reported. Mosquitoes from the janthinomys/capricornii group were only found at eight sites in the São José do Rio Preto region, while Sabethes chloropterus was found at one site in Ribeirão Preto. H. leucocelaenus showed its capacity to adapt to a secondary and degraded environment. Our results indicate a wide receptive area for yellow fever transmission in the State of São Paulo, with particular emphasis on the possibility of H. leucocelaenus being involved in the maintenance of this sylvatic focus of the disease.

[1]  A. Failloux,et al.  Large genetic differentiation and low variation in vector competence for dengue and yellow fever viruses of Aedes albopictus from Brazil, the United States, and the Cayman Islands. , 2003, The American journal of tropical medicine and hygiene.

[2]  M. V. Guerra,et al.  [Culicidae insect fauna from rural zone in Amazonas State with incidence of sylvatic yellow fever]. , 2003, Revista da Sociedade Brasileira de Medicina Tropical.

[3]  H. B. Vasconcelos,et al.  Isolations of yellow fever virus from Haemagogus leucocelaenus in Rio Grande do Sul State, Brazil. , 2003, Transactions of the Royal Society of Tropical Medicine and Hygiene.

[4]  R. Lourenço-de-Oliveira,et al.  Oral susceptibility to yellow fever virus of Aedes aegypti from Brazil. , 2002, Memorias do Instituto Oswaldo Cruz.

[5]  D. Bicout,et al.  Isolation of yellow fever virus from nulliparous Haemagogus (Haemagogus) janthinomys in eastern Amazonia. , 2002, Vector borne and zoonotic diseases.

[6]  S. Rodrigues,et al.  Epidemic of jungle yellow fever in Brazil, 2000: Implications of climatic alterations in disease spread , 2001, Journal of medical virology.

[7]  Délsio Natal,et al.  Aedes albopictus em área rural do Brasil e implicações na transmissão de febre amarela silvestre* Aedes albopictus in rural zone of Brazil and its implication in the sylvatic yellow fever transmission , 1999 .

[8]  S. Rodrigues,et al.  An epidemic of sylvatic yellow fever in the southeast region of Maranhao State, Brazil, 1993-1994: epidemiologic and entomologic findings. , 1997, The American journal of tropical medicine and hygiene.

[9]  O. P. Forattini,et al.  Principais mosquitos de importância sanitária no Brasil , 1995 .

[10]  D. Chadee,et al.  Seasonality, biting cycle and parity of the yellow fever vector mosquito Haemagogus janthinomys in Trinidad , 1992, Medical and veterinary entomology.

[11]  S. Rodrigues,et al.  New entomological and virological data on the vectors of sylvatic yellow fever in Brazil , 1992 .

[12]  S. Rodrigues,et al.  Modifications of arbovirus transmission in relation to construction of dams in Brazilian Amazonia , 1992 .

[13]  D. Chadee.  Seasonal abundance and diel landing periodicity of Sabethes chloropterus (Diptera: Culicidae) in Trinidad, West Indies. , 1990, Journal of medical entomology.

[14]  V. Alves,et al.  Investigação epidemiológica de casos de febre amarela na região noroeste do Estado de São Paulo, Brasil , 1987 .

[15]  D. Roberts,et al.  Associations of arbovirus vectors with gallery forests and domestic environments in southeastern Bolivia. , 1984, Bulletin of the Pan American Health Organization.

[16]  A. T. D. Rosa,et al.  Ecologia da febre amarela no Brasil , 1983 .

[17]  H. W. Kumm,et al.  The Rôle of Aëdes leucocelaenus in the Epidemiology of Jungle Yellow Fever in Brazil , 1951 .

[18]  F. L. Soper,et al.  YELLOW FEVER WITHOUT AËDES AEGYPTI. STUDY OF A RURAL EPIDEMIC IN THE VALLE DO CHANAAN, ESPIRITO SANTO, BRAZIL, 1932 , 1933 .