| feeding preferences of triatoma dimidiata maculipennis in yucatan, mexico. | to determine whether a low preference for human blood by triatoma dimidiata maculipennis stal, 1859, the only known vector of chagas' disease in yucatan, mexico, would account for the low prevalence of antibodies to trypanosoma cruzi in man in the area, the intestinal contents of 924 bugs were tested against antisera to blood antigens of chicken, opossum, dog, bat, monkey, pig, goat, rabbit, horse, human, rat, ox, cat, and armadillo. although the chicken was the primary host, man was fed upon fr ... | 1977 | 320892 |
| the opossum didelphis virginiana as a synanthropic reservoir of trypanosoma cruzi in dzidzilché, yucatán, méxico. | in méxico, the role of mammals in the transmission cycle of trypanosoma cruzi is poorly known. in the state of yucatán, an endemic area of chagas disease, both didelphis virginiana and d. marsupialis occur sympatrically. however, until now, only the former species had been found infected with t. cruzi. to evaluate the role of d. virginiana in a peridomestic transmission, nine periods of capture-recapture were performed around the village of dzidzilché, yucatán. the sex, age, reproductive status, ... | 2002 | 12219121 |
| geographic distribution of triatoma dimidiata and transmission dynamics of trypanosoma cruzi in the yucatan peninsula of mexico. | chagas disease represents a major public health concern in most of latin america, and its control is currently based on vector control and blood bank screening. we investigated the geographic distribution and seasonal variations in triatomine populations in the yucatan peninsula of mexico to obtain entomologic data for the optimization of potential control programs. we collected domiciliated and peri-domiciliated triatoma dimidiata from 115 houses in 23 villages distributed throughout most of th ... | 2002 | 12389944 |
| predicting triatoma dimidiata abundance and infection rate: a risk map for natural transmission of chagas disease in the yucatan peninsula of mexico. | chagas disease, a major public health problem in latin america, is caused by the protozoan parasite trypanosoma cruzi and transmitted by hematophageous insects from the triatominae subfamily. control of this disease is based on domestic vector control with insecticides and improvements in housing. as with other vector-borne diseases, the identification of areas of high risk of disease transmission is a major prerequisite for the planning and implementation of cost-effective control programs. in ... | 2004 | 15155983 |
| re-infestation of houses by triatoma dimidiata after intra-domicile insecticide application in the yucatán peninsula, mexico. | in most countries, chagas disease transmission control remains based on domestic insecticide application. we thus evaluated the efficacy of intra-domicile cyfluthrin spraying for the control of triatoma dimidiata, the only chagas disease vector in the yucatán peninsula, mexico, and monitored potential re-infestation every 15 days for up to 9 months. we found that there was a re-infestation of houses by adult bugs starting 4 months after insecticide application, possibly from sylvatic/peridomicil ... | 2004 | 15273795 |
| morphometric analysis of triatoma dimidiata populations (reduviidae:triatominae) from mexico and northern guatemala. | triatoma dimidiata is one of the major vectors of chagas disease in latin america. its range includes mexico, all countries of central america, colombia, and ecuador. in light of recent genetic analysis suggesting that the possible origin of this species is the yucatan peninsula, we have analyzed populations from the state of yucatan, san luis potosi, and veracruz in mexico, and a population from the southern region of the yucatan peninsula located in northern guatemala, the region of el peten. ... | 2005 | 16184224 |
| effect of hurricane isidore on triatoma dimidiata distribution and chagas disease transmission risk in the yucatán peninsula of mexico. | hurricanes can have devastating effects on health and may directly modulate vector-borne diseases. chagas disease is a zoonosis caused by the protozoan parasite trypanosoma cruzi and transmitted by triatomine bugs, and the effect of hurricanes on these bugs is largely unknown. we thus performed a detailed study of the changes in triatoma dimidiata geographic distribution and infection rates after hurricane isidore devastated the yucatán peninsula in september 2002. bugs were collected in 34 vill ... | 2005 | 16354805 |
| cuticular hydrocarbon variability among triatoma dimidiata (hemiptera: reduviidae) populations from mexico and guatemala. | the geographic variation in the cuticular hydrocarbon pattern among 11 populations of triatoma dimidiata latreille (hemiptera: reduviidae: triatominae) from different regions of mexico and guatemala, was studied using capillary gas chromatography. t. dimidiata populations were differentiated based on the relative amounts of 71 hydrocarbon components. insect population classification was mostly in agreement with their geographical vicinity; mexican populations from the yucatan peninsula grouped t ... | 2005 | 16363161 |
| chromosomal variation and genome size support existence of cryptic species of triatoma dimidiata with different epidemiological importance as chagas disease vectors. | the wide geographical distribution of triatoma dimidiata, one of the three major vectors of chagas disease, ranges from mexico to northern peru. since this species occupies a great diversity of artificial and natural ecotopes, its eradication is extremely difficult. in order to assist control efforts, we used chromosome analyses and dna amount as taxonomic markers to study genetic variability in populations of t. dimidiata from mexico, guatemala, el salvador and colombia. we differentiated three ... | 2006 | 16827710 |
| assessment of triatoma dimidiata dispersal in the yucatan peninsula of mexico by morphometry and microsatellite markers. | in the yucatán peninsula of mexico, the main vector of chagas disease is triatoma dimidiata. field studies suggest that natural transmission occurs through transient and seasonal invasion of houses by sylvatic/peridomestic triatomines, rather than through persistent domiciliated bug populations. we investigated the genetic structure of t. dimidiata populations, using morphometry and microsatellite markers, to assess dispersal of individuals in this triatomine species and to understand the dynami ... | 2007 | 17488918 |
| urban infestation by triatoma dimidiata in the city of mérida, yucatán, méxico. | the observation of widespread seasonal infestation by triatoma dimidiata in rural villages around the city of mérida, yucatán, méxico, led us to reconsider the presence of chagas disease vectors and the risk factors for house infestation in the city itself. bugs were collected in 150 houses from 30 neighborhoods distributed throughout the city. we observed a widespread infestation by t. dimidiata in the city, with 38% of infested houses and 48% of the collected triatomines testing positive for t ... | 2007 | 17979537 |
| demographic and dispersal constraints for domestic infestation by non-domicilated chagas disease vectors in the yucatan peninsula, mexico. | chagas disease is one of the most important diseases in latin america. insecticides have been sprayed to control domiciliated vectors. however, some triatomine species are not strictly domiciliated, and the transmission risk posed by immigrants is identified as a major challenge. the design of new control strategies requires disentangling the importance of demography and immigration in vector occurrence inside houses. using a population dynamics model, we confirmed that dispersal can explain sat ... | 2008 | 18187796 |
| two distinct triatoma dimidiata (latreille, 1811) taxa are found in sympatry in guatemala and mexico. | approximately 10 million people are infected with trypanosoma cruzi, the causative agent of chagas disease, which remains the most serious parasitic disease in the americas. most people are infected via triatomine vectors. transmission has been largely halted in south america in areas with predominantly domestic vectors. however, one of the main chagas vectors in mesoamerica, triatoma dimidiata, poses special challenges to control due to its diversity across its large geographic range (from mexi ... | 2009 | 19274073 |
| optimization of control strategies for non-domiciliated triatoma dimidiata, chagas disease vector in the yucatán peninsula, mexico. | chagas disease is the most important vector-borne disease in latin america. regional initiatives based on residual insecticide spraying have successfully controlled domiciliated vectors in many regions. non-domiciliated vectors remain responsible for a significant transmission risk, and their control is now a key challenge for disease control. | 2009 | 19365542 |
| variations in sex ratio, feeding, and fecundity of triatoma dimidiata (hemiptera: reduviidae) among habitats in the yucatan peninsula, mexico. | chagas' disease is a major public health concern in most latin american countries and its prevention is based on insect vector control. previous work showed that in the yucatan peninsula of mexico, houses are transiently infested by adult triatoma dimidiata, which then fail to establish sustained colonies. the present study was designed to evaluate the seasonality and possible causes of the dispersal of sylvatic t. dimidiata toward the houses and the subsequent failure of colonization. dispersal ... | 2009 | 19480605 |
| identification of a large hybrid zone between sympatric sibling species of triatoma dimidiata in the yucatan peninsula, mexico, and its epidemiological importance. | triatoma dimidiata is one of the major chagas disease vectors, with an extensive diversity in its morphology, habitat, and level of domiciliation. molecular studies based on the internal transcribed spacer 2 (its-2) have subdivided this species into four potential taxonomic groups. using both its-2 and cytochrome b markers, we confirmed the sibling species status of its-2 group 3 and detected an apparent sympatry of its-2 groups 2 and 3 in the yucatan peninsula, mexico. here we examine the geogr ... | 2009 | 19786121 |
| patterns of house infestation dynamics by non-domiciliated triatoma dimidiata reveal a spatial gradient of infestation in rural villages and potential insect manipulation by trypanosoma cruzi. | chagas disease is a major vector-borne parasitic disease in latin america, primarily transmitted to humans by triatomine vectors. non-domiciliated triatomine species such as triatoma dimidiata in the yucatan peninsula, mexico, can transiently invade houses and are emerging as a major challenge to control trypanosoma cruzi transmission to humans. we analyzed the spatio-temporal spreading of house infestation by t. dimidiata in four rural villages. | 2010 | 19912593 |
| comparative field trial of alternative vector control strategies for non-domiciliated triatoma dimidiata. | chagas disease is a major vector-borne disease, and regional initiatives based on insecticide spraying have successfully controlled domiciliated vectors in many regions. non-domiciliated vectors remain responsible for a significant transmission risk, and their control is a challenge. we performed a proof-of-concept field trial to test alternative strategies in rural yucatan, mexico. follow-up of house infestation for two seasons following the interventions confirmed that insecticide spraying sho ... | 2010 | 20064997 |