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Distribution of domestic Triatominae and stratification of Chagas Disease transmission in Oaxaca, Mexico
Author(s) -
Ramsey J. M.,
Ordoñez R.,
CruzCelis A.,
Alvear A. L.,
Chavez V.,
Lopez R.,
Pintor J. R.,
Gama F.,
Carrillo S.
Publication year - 2000
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1046/j.1365-2915.2000.00214.x
Subject(s) - triatominae , chagas disease , rhodnius prolixus , biology , vector (molecular biology) , reduviidae , trypanosoma cruzi , ecology , population , altitude (triangle) , infestation , transmission (telecommunications) , zoology , hemiptera , veterinary medicine , environmental health , virology , parasite hosting , medicine , mathematics , recombinant dna , world wide web , computer science , engineering , biochemistry , geometry , botany , insect , electrical engineering , gene
Summary Mexico has 18 species of Triatomine bugs (Hemiptera: Reduviidae) reported to be vectors of Trypanosoma cruzi. Chagas Disease is widespread in Mexico, with up to 3.5% seropositivity of human transfusion blood. The State of Oaxaca has the longest history of endemic Chagas Disease, based on acute and chronic case reports, and of entomological surveys in the country. However, the State health care services need more information on current risks of vector transmission. In order to identify and characterize areas of transmission in Oaxaca and to stratify the vector potential, the distribution of domestic Triatominae was surveyed during 1996–98 in collaboration with the primary health care services and local communities. Villages were studied in 11% of 570 municipalities in Oaxaca. Eight triatomine species were found in domestic and peri‐domestic habitats: Triatoma barberi Usinger , T. bolivari Carcavallo et al . T. dimidiata (Latreille) , T. mazzottii Usinger , T. nitida Usinger , T. pallidipennis (Stal) , T. phyllosoma (Burmeister) and Rhodnius prolixus Stal. For each triatomine species in Oaxaca, the range of distribution and habitat characteristics are described. Habitat partitioning, principally based on altitude and mean annual precipitation, limited the overlap of distribution between species. Relatively consistent altitude of human settlements facilitates the dispersion of individual species within microregions. Entomological indices of house infestation were used to estimate that ∼50% of the human population (1874 320 inhabitants) would be at risk of vector transmission, with a minimum of 134 320 infected people and 40 280 chronic cases of Chagas Disease currently in Oaxaca.