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Factores bióticos y abióticos que determinan la seroprevalencia de anticuerpos contra Trypanosoma Cruzi en el municipio de Palmar de Bravo, Puebla, México
Sosa-Jurado,Francisca; Zumaquero-Ríos,José Lino; Reyes,Pedro A; Cruz-García,Abel; Guzmán-Bracho,Carmen; Monteón,Víctor M;
Salud Pública de México , 2004, DOI: 10.1590/S0036-36342004000100006
Abstract: objective: to establish the relationship between seroprevalence for antibodies against trypanosoma cruzi and its relationship with biotic and abiotic factors. material and methods: a cross-sectional study was conducted between august 2000 and september 2001. the study population consisted of a simple random sample of 390 volunteers residing in palmar de bravo, puebla, mexico. sample and data collection procedures included assaying antibodies against t cruzi with validated assays, and searching for domestic reservoirs and triatomine bugs. the relationship between biotic and abiotic factors with seropositivity was assessed. statistical analysis was conducted using kappa values for diagnostic tests; statistical significance was assessed with 2 x 2 tables, chi-squared test with yates' correction, fisher exact test, and odds ratios. results: the seroprevalence of t cruzi infection in humans was 4%; in domestic reservoirs (horses, pigs, and dogs) only 10% of canine reservoirs were positive. vector species recognized were t barberi and t pallidipennis, with a dispersion area index and a colonization index of 55% and 40%, respectively. the most important risk factors associated with positive serology were altitude (>2 150 y <2 180 meters above sea level), presence of triatomines, age, time of residence, and participation in a social assistance program. conclusions: t cruzi infection was identified in human beings, vectors, and possibly in domestic reservoirs, in communities located over 2 000 meters above sea level.
Pathological alterations and prevalence of Trypanosoma cruzi in opossums from western Mexico
Villagrán,Maria Elena; Martínez-Ibarra,José Alejandro; de Diego,José Antonio;
Boletín de Malariología y Salud Ambiental , 2011,
Abstract: there are scarce reports about lesions and pathological alterations by trypanosoma cruzi infections on opossums (didelphis virginiana), considered some of the most important reservoir hosts for t. cruzi in western mexico. after two serological analyses (serodia and iha), 12 (24%) of 50 collected opossums in two small towns in western mexico were positive for the presence of t. cruzi. eight had some kind of organ alterations: four with alterations in only one organ, three in two organs and one with alterations in three organs. splenomegaly was the most common alteration in the examined opossums. in light of the present findings, it is possible that organ alterations on studied opossums may have been associated with t. cruzi infections.
Infection by Trypanosoma cruzi in mammals in Yucatan, Mexico: a serological and parasitological study
Zavala-Velázquez, J;Barrera-Pérez, M;Rodríguez-Félix, M.E;Guzmán-Marín, E;Ruíz-Pi?a, H;
Revista do Instituto de Medicina Tropical de S?o Paulo , 1996, DOI: 10.1590/S0036-46651996000400009
Abstract: in order to determine trypanosoma cruzi infection among mammals in yucatan, mexico, 372 animals, both wild and synanthropic including carnivores, marsupials and rodents were studied. serological studies by indirect haemagglutination (iha) were carried out to detect antibodies to t. cruzi and a parasitological study was also performed (blood smear and histopathology). of all the animals tested 18.54% were serologically positive, with a significantly higher frequency among the wild ones (33.33%) compared to the synanthropic ones (17.79%). to determine t. cruzi in positive animals, blood was inoculated into a white mouse (webster type) to prove myocardium colonization. the serological and parasitological positivity of these animals, as well as their behavior in the environment, taken together with the socioeconomic and cultural characteristics of the population, suggest that in yucatan, mexico, canis familiaris, didelphis marsupialis and rattus rattus act as a link with the wild cycle.
Trypanosoma cruzi in dogs: electrocardiographic and echocardiographic evaluation, in Malinalco, State of Mexico  [cached]
González-Vieyra SD,Ramírez-Durán N,Sandoval-Trujillo ÁH,Vázquez-Chagoyán JC
Research and Reports in Tropical Medicine , 2011,
Abstract: Sandra Díaz González-Vieyra1, Ninfa Ramírez-Durán2, ángel H Sandoval-Trujillo3, Juan C Vázquez-Chagoyán1, Humberto G Monroy-Salazar1, Alberto Barbabosa-Pliego11Research Center of Advanced Studies in Animal Health, Veterinary Husbandry School, 2Medical and Ambiental Microbiology, Research Center of Advanced Studies in Health Science, School of Medicine, Autonomous University of the State of Mexico, Toluca, Mexico; 3Department of Biological Systems, Metropolitan Autonomous University, Xochimilco, Mexico City, MexicoAbstract: Chagas disease caused by Trypanosoma cruzi is an important public health problem in Latin America. Dogs are considered a risk factor for human Chagas disease, a sentinel for T. cruzi infection in endemic regions and an animal model to study pathological aspects of the disease. The potential use of dogs as indicators of human cardiac pathogenicity of local T. cruzi strains has been studied insufficiently. We studied electrocardiographic (EKG) and echocardiographic (ECG) alteration frequencies observed in an open population of dogs in Malinalco, Mexico, and determined if such frequencies were statistically associated with T. cruzi infection in dogs. Animals (n = 139) were clinically examined and owners were asked to answer a questionnaire about dogs’ living conditions. Two commercial serological tests (IHA, ELISA) were conducted to detect anti-T. cruzi serum antibodies. Significant differences between seropositive and seronegative animals in cardiomyopathic frequencies were detected through EKG and ECG (P < 0.05). Thirty dogs (21.58%) were serologically positive to anti-T. cruzi antibodies (to ELISA and IHA assays), of which nine (30%) had EKG and/or ECG alterations. From the remaining 104 (78.42%) seronegative animals, five (4.5%) had EKG and/or ECG abnormalities. Our data support the hypothesis that most EKG and ECG alterations found in dogs from Malinalco could be associated with T. cruzi infection. Considering the dog as a sentinel and as an animal model for Chagas disease in humans, our findings suggest that the T. cruzi strains circulating in Malinalco have the potential to produce cardiomyopathies in infected humans.Keywords: chagas disease, Trypanosoma cruzi, cardiomyopathy, electrocardiography, echocardiography, Malinalco, México
Trypanosoma cruzi in dogs: electrocardiographic and echocardiographic evaluation, in Malinalco, State of Mexico
González-Vieyra SD, Ramírez-Durán N, Sandoval-Trujillo áH, Vázquez-Chagoyán JC, Monroy-Salazar HG, Barbabosa-Pliego A
Research and Reports in Tropical Medicine , 2011, DOI: http://dx.doi.org/10.2147/RRTM.S21683
Abstract: ypanosoma cruzi in dogs: electrocardiographic and echocardiographic evaluation, in Malinalco, State of Mexico Original Research (1807) Total Article Views Authors: González-Vieyra SD, Ramírez-Durán N, Sandoval-Trujillo áH, Vázquez-Chagoyán JC, Monroy-Salazar HG, Barbabosa-Pliego A Published Date December 2011 Volume 2011:2 Pages 155 - 161 DOI: http://dx.doi.org/10.2147/RRTM.S21683 Sandra Díaz González-Vieyra1, Ninfa Ramírez-Durán2, ángel H Sandoval-Trujillo3, Juan C Vázquez-Chagoyán1, Humberto G Monroy-Salazar1, Alberto Barbabosa-Pliego1 1Research Center of Advanced Studies in Animal Health, Veterinary Husbandry School, 2Medical and Ambiental Microbiology, Research Center of Advanced Studies in Health Science, School of Medicine, Autonomous University of the State of Mexico, Toluca, Mexico; 3Department of Biological Systems, Metropolitan Autonomous University, Xochimilco, Mexico City, Mexico Abstract: Chagas disease caused by Trypanosoma cruzi is an important public health problem in Latin America. Dogs are considered a risk factor for human Chagas disease, a sentinel for T. cruzi infection in endemic regions and an animal model to study pathological aspects of the disease. The potential use of dogs as indicators of human cardiac pathogenicity of local T. cruzi strains has been studied insufficiently. We studied electrocardiographic (EKG) and echocardiographic (ECG) alteration frequencies observed in an open population of dogs in Malinalco, Mexico, and determined if such frequencies were statistically associated with T. cruzi infection in dogs. Animals (n = 139) were clinically examined and owners were asked to answer a questionnaire about dogs’ living conditions. Two commercial serological tests (IHA, ELISA) were conducted to detect anti-T. cruzi serum antibodies. Significant differences between seropositive and seronegative animals in cardiomyopathic frequencies were detected through EKG and ECG (P < 0.05). Thirty dogs (21.58%) were serologically positive to anti-T. cruzi antibodies (to ELISA and IHA assays), of which nine (30%) had EKG and/or ECG alterations. From the remaining 104 (78.42%) seronegative animals, five (4.5%) had EKG and/or ECG abnormalities. Our data support the hypothesis that most EKG and ECG alterations found in dogs from Malinalco could be associated with T. cruzi infection. Considering the dog as a sentinel and as an animal model for Chagas disease in humans, our findings suggest that the T. cruzi strains circulating in Malinalco have the potential to produce cardiomyopathies in infected humans.
Seroprevalence of human Trypanosoma cruzi infection in diferent geografic zones of Chiapas, Mexico
Mazariego-Arana, Miguel Angel;Monteón, Victor M.;Ballinas-Verdugo, Martha Alicia;Hernández-Becerril, Nidia;Alejandre-Aguilar, Ricardo;Reyes, Pedro A.;
Revista da Sociedade Brasileira de Medicina Tropical , 2001, DOI: 10.1590/S0037-86822001000500008
Abstract: a serologic survey was carried out in four different geographic zones of chiapas, mexico. a total of 1,333 samples were collected from residents of thirteen communities located on the coast, central mountain, lacandon forest and a zone called mesochiapas. one hundred and fifty one seropositive individuals (11.3%) were identified. human trypanosoma cruzi infection was influenced by geography. in the lacandon forest and central mountains there was a higher seroprevalence 32.1 and 13.8% respectively, than on the coast (1.2%). in mesochiapas there were no seropositive individuals among the 137 persons tested. an active transmission is probably continuing because seropositive cases (13.8%) were detected in children under 10 years of age. the vector recognized on the coast was triatoma dimidiata while in the lacandon forest it was rhodnius prolixus.
Seroprevalence of human Trypanosoma cruzi infection in diferent geografic zones of Chiapas, Mexico
Mazariego-Arana Miguel Angel,Monteón Victor M.,Ballinas-Verdugo Martha Alicia,Hernández-Becerril Nidia
Revista da Sociedade Brasileira de Medicina Tropical , 2001,
Abstract: A serologic survey was carried out in four different geographic zones of Chiapas, Mexico. A total of 1,333 samples were collected from residents of thirteen communities located on the Coast, Central Mountain, Lacandon Forest and a zone called Mesochiapas. One hundred and fifty one seropositive individuals (11.3%) were identified. Human Trypanosoma cruzi infection was influenced by geography. In the Lacandon Forest and Central Mountains there was a higher seroprevalence 32.1 and 13.8% respectively, than on the coast (1.2%). In Mesochiapas there were no seropositive individuals among the 137 persons tested. An active transmission is probably continuing because seropositive cases (13.8%) were detected in children under 10 years of age. The vector recognized on the Coast was Triatoma dimidiata while in the Lacandon Forest it was Rhodnius prolixus.
Synanthropic rodent reservoirs of Trypanosoma (Schizotrypanum) cruzi in the valley of Caracas, Venezuela
HERRERA, Leidi;URDANETA-MORALES, Servio;
Revista do Instituto de Medicina Tropical de S?o Paulo , 1997, DOI: 10.1590/S0036-46651997000500006
Abstract: direct blood examination and xenodiagnosis of 47 synanthropic rodents (rattus rattus, r. norvegicus, mus musculus) captured in the valley of caracas, venezuela, revealed trypanosomal infections in 12 r. rattus, 10 with t. lewisi and 2 with t. cruzi. of the latter the course of parasitemia, the pleomorphism of the bloodstream trypomastigotes, tissue tropism in naturally and experimentally infected rats and mice, host mortality, morphology of fecal parasites in rhodnius prolixus used for xenodiagnosis, and infectivity of the bug feces for nmri mice, were all characteristic of trypanosoma (schizotrypanum) cruzi. one rat, with a patent parasitemia, had numerous nests of amastigotes in cardiac muscle and moderate parasitism of the smooth muscle of the duodenum and of skeletal muscle. mice inoculated with fecal flagellates from the bugs had moderate tissue tropism in the same organs and also in the colon and pancreas. the possible role of r. rattus in the establishment of foci of chagas? disease in caracas is discussed
Synanthropic rodent reservoirs of Trypanosoma (Schizotrypanum) cruzi in the valley of Caracas, Venezuela  [cached]
HERRERA Leidi,URDANETA-MORALES Servio
Revista do Instituto de Medicina Tropical de S?o Paulo , 1997,
Abstract: Direct blood examination and xenodiagnosis of 47 synanthropic rodents (Rattus rattus, R. norvegicus, Mus musculus) captured in the valley of Caracas, Venezuela, revealed trypanosomal infections in 12 R. rattus, 10 with T. lewisi and 2 with T. cruzi. Of the latter the course of parasitemia, the pleomorphism of the bloodstream trypomastigotes, tissue tropism in naturally and experimentally infected rats and mice, host mortality, morphology of fecal parasites in Rhodnius prolixus used for xenodiagnosis, and infectivity of the bug feces for NMRI mice, were all characteristic of Trypanosoma (Schizotrypanum) cruzi. One rat, with a patent parasitemia, had numerous nests of amastigotes in cardiac muscle and moderate parasitism of the smooth muscle of the duodenum and of skeletal muscle. Mice inoculated with fecal flagellates from the bugs had moderate tissue tropism in the same organs and also in the colon and pancreas. The possible role of R. rattus in the establishment of foci of Chagas? disease in Caracas is discussed
Natural infection of Trypanosoma cruzi in a dog with heart lesions: a case report from Malinalco, State of Mexico, Mexico
A Barbabosa-Pliego, V Velázquez-Ordó ez, MC López-Rosas, et al
Research and Reports in Tropical Medicine , 2010, DOI: http://dx.doi.org/10.2147/RRTM.S14205
Abstract: tural infection of Trypanosoma cruzi in a dog with heart lesions: a case report from Malinalco, State of Mexico, Mexico Case report (3253) Total Article Views Authors: A Barbabosa-Pliego, V Velázquez-Ordó ez, MC López-Rosas, et al Published Date November 2010 Volume 2010:1 Pages 73 - 76 DOI: http://dx.doi.org/10.2147/RRTM.S14205 A Barbabosa-Pliego1, V Velázquez-Ordó ez1, MC López-Rosas1, MU Alonso-Fresán1, E Burgos-Aparicio1, L Ochoa-García2, V Camacho-Sierra1, C Guzmán-Bracho3, S Martínez-Casta eda1, RC Fajardo-Mu oz1, JG Estrada-Franco4,6, NJ Garg4,5, JC Vázquez-Chagoyán1 1Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia Universidad Autónoma del Estado de México, Toluca, México; 2Laboratorio Estatal de Salud Pública del Instituto Salud del Estado de México; 3Instituto de Diagnóstico y Referencia Epidemiológicos, SSA, Mexico; 4Departments of Pathology, 5Microbiology and Immunology, University of Texas Medical Branch, USA; 6Universidad Autónoma de Chiapas, Tapachula, Chiapas, México Background: Chagas disease is widely distributed in tropical and subtropical regions of the Americas, including more than 50% of the Mexican territory. The southern region of the State of Mexico (the Tejupilco Sanitary Jurisdiction) was recently reported as endemic; however the pathogenicity of the circulating strains has not been studied in depth. Recent studies have reported Trypanosoma cruzi seropositive dogs in the villages of Malinalco and Zumpahuacan in the central south of the State of Mexico. Dogs are epidemiologically important, because the evolution of symptoms and pathology of Chagas disease in this vertebrate mimics the human disease, and because dogs maintain the domestic cycle of parasite transmission. Objectives: To study the clinical and pathological findings of a dog showing serological evidence of T. cruzi infection. The study of the canine, identified in the Malinalco locality, is expected to contribute to the general characterization and behavior of the pathogen in the region. Methods: Clinical (electrocardiogram, echocardiogram and clinical exam), pathological (necropsy and histopathology) and serologic (indirect hemagglutination test and enzyme-linked immunoassay) analyses were conducted in a 4-year-old dog naturally infected with T. cruzi. Results: The canine was diagnosed with dilated cardiomyopathy and hepatomegaly associated with congestive cardiac insufficiency, presumably provoked by chronic myocarditis and derived from natural infection with T. cruzi. Conclusion: T. cruzi strains circulating in the village of Malinalco, State of Mexico are pathogenic for dogs, and could be affecting other domestic animals, and even infecting humans in the region.
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