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      The process of domestication in triatominae


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          Chagas disease in the Amazon Basin: association of Panstrongylus geniculatus (Hemiptera: Reduviidae) with domestic pigs.

          Just over 100 autochthonous cases of Chagas disease are reported from the Brazilian Amazon Basin. Panstrongylus geniculatus (Latreille) occurs throughout the region and is the known vector of Trypanosoma cruzi, principal zymodeme 3 (Z3) to the armadillo Dasypus novemcinctus. In the small riverine community of Furo do Rio Pau Grande, pigsties adjoining houses were heavily infested with P. geniculatus, which repeatedly attacked local inhabitants. Palm trees in the immediate vicinity were also infested. T. cruzi principal zymodeme 1 (Z1) was isolated from P. geniculatus, domestic pigs, and opossums, but no human infections were detected. The threat of endemic Chagas disease to the Amazon Basin from either domiciliation of local silvatic triatomine species, or from migration of domestic vectors, demands a program of vigilance and plans of action to eliminate household triatomine colonies.
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            Antennal sensilla of triatominae (Hemiptera, Reduviidae): A comparative study of five genera

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              Mitochondrial DNA sequence variation among triatomine vectors of Chagas' disease.

              Kissing bugs or triatomines (Reduviidae: Triatominae) are vectors of the Chagas' disease agent Trypanosoma cruzi. There is a current need for more sensitive tools for use in discrimination of different bug populations and species, thus allowing a better understanding of these insects as it relates to disease transmission and control. In a preliminary analysis of the mitochondrial large subunit ribosomal RNA (mtlsurRNA) and cytochrome B (mtCytB) genes, we used DNA sequencing to study species identification and phylogeny. In both examined gene regions, about 46% of nucleotide positions exhibited polymorphism. The examined region of mtCytB appears to have evolved more rapidly than the examined region of mtlsurRNA. Phylogenetic analysis of both gene fragments in the examined species produced similar results that were generally consistent with the accepted taxonomy of the subfamily. The two major tribes, Rhodniini and Triatomini, were supported, along with additional clades that corresponded to accepted species complexes within the Rhodnius and Triatoma genera. The one chief exception was that Psammolestes coreodes sorted into the Rhodnius prolixus-robustus-neglectus clade, with bootsrap values of 99% and 81%, respectively, for the mtlsurRNA and mtCytB fragments. All of the individual species examined could be distinguished at both genetic loci.

                Author and article information

                Memórias do Instituto Oswaldo Cruz
                Mem. Inst. Oswaldo Cruz
                Instituto Oswaldo Cruz, Ministério da Saúde (Rio de Janeiro, RJ, Brazil )
                September 1999
                : 94
                : suppl 1
                : 375-378
                [02] Belo Horizonte MG orgnameFiocruz orgdiv1 Centro de Pesquisas Rene Rachou Brasil
                [03] La Paz orgnameIBBA orgdiv1 ORSTOM Bolivia
                [01] London orgnameLSHTM orgdiv1 Department of Infectious and Tropical Diseases UK
                S0074-02761999000700073 S0074-0276(99)09400073

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                : 09 August 1999
                : 09 June 1999
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 28, Pages: 4

                SciELO Brazil

                Epidemiology and dynamics of vectorial transmission of Chagas disease

                domestication,dispersal,Triatominae,Chagas disease,population genetics


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