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Search Results: 1 - 10 of 597 matches for " triatoma mexicana "
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Triatoma mexicana (Hemiptera: Reduviidae) in Guanajuato, Mexico: house infestation and seasonal variation
Salazar Schettino, Paz María;Rosales Pi?a, José Santiago;Rojas Wastavino, Gloria;Cabrera Bravo, Margarita;Vences Blanco, Mauro;López Cárdenas, Jorge;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000118
Abstract: triatoma mexicana was described by herrich-schaeffer in 1848. in 1940, a male specimen was found in hidalgo. in 1970, this species was recorded in the state of queretaro. later, it was registered in guanajuato and san luis potosi. in the present paper we performed an investigation in 545 dwellings from three counties in the state of guanajuato, mexico, from march 2003 to may 2004. the search and capture of triatomines were seasonally performed indoors and outdoors. entomological indexes were calculated. the risk and no risk relations between triatomine presence and housing construction materials were analyzed. fourteen triatomines were collected indoors and 151 outdoors. the vectors were collected in houses built with either risky and non-risky materials. adults go indoors but do not settle there, hence, no relationship was found between the building materials and infestation of houses. conventional interventions like house improvement or insecticide spraying are not efficient for the control of t. mexicana, because its developmental cycle is accomplished outdoors in the area surrounding the houses.
Influence of temperature and humidity on the biology of Triatoma mexicana (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Salazar-Schettino, Paz María;Solorio-Cibrián, Miriam;Cabrera Bravo, Margarita;Novelo-López, Mónica;Vences, Mauro Omar;Montes-Ochoa, Jazmín Yesenia;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000700015
Abstract: several biological parameters related to the triatoma mexicana life-cycle were evaluated in this study. three cohorts were maintained under different combinations of temperature and relative humidity (rh): 25oc/50% rh; 25oc/75% rh; and 30oc/75% rh. observed hatching rates varied from 49-57.5% whereas the average time of hatching varied from 19.5-22.7 days. in the three cohorts studied, the mean time-lapse between presentation of the blood meal and the beginning of feeding was less than 5 min in all instars; the mean feeding time was longer than 10 min in all the instars; the post-feed defecation delay was over 10 min in all the instars. less than 50% of nymphs in each cohort completed the cycle and the average time from 1st instar nymph to adult was more than 255 days for the three cohorts. the number of blood meals before molt at each nymphal instar varied from 1-9. our results appear to indicate a lack of influence of temperature and rh on the biological parameters of t. mexicana that were studied, which could reflect the adaptation capacity of this species. we also conclude that t. mexicana can not be considered an effective transmitter of trypanosoma cruzi to human populations in areas where this species is currently present.
Riesgo de transmisión de Trypanosoma cruzi en el municipio de Metztitlán, estado de Hidalgo, México, mediante la caracterización de unidades domiciliares y sus índices entomológicos
Becerril, Marco A;Angeles-Pérez, Vidal;Noguez-García, Julio Cr;Imbert-Palafox, José L;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000500021
Abstract: in order to determine the risk of transmission of trypanosoma cruzi by triatomines in metztitlan municipality, hidalgo state, mexico, entomological indexes were calculated and the characteristics of dwellings were described. a transversal, retrospective, descriptive, and observational study was performed by means of an intentional not probabilistic and expertise sampling from january to december of 2005 in 10 localities in which presence of triatomines were investigated either intra or peridomestic environmental in 699 houses. building material and presence of infected triatomines with t. cruzi were registered to determine entomologic indexes. the triatomine species collected were: triatoma barberi (usinger) and t. mexicana (herrich-schaeffer) (hemiptera: reduviidae). the results indicated that natural infection index varied from 7.7% to 50%; colonization index reached 80%; infestation index varied from 7.7% to 25%; dispersion index was 70%. stone-walled houses were more infested. we can conclude that it is necessary to establish t. cruzi transmission control measures against triatomines in localities from metztitlan, primarily in stone-walled houses where t. barberi occurs, as it was the most important vector species in the transmission of t. cruzi in this municipality.
La Gripe Mexicana
Dr. Elmer Huerta
REDVET , 2009,
Abstract: ResumenEl viernes 24 de abril a las ocho y media de la ma ana recibo enWashington DC una llamada de los productores de CNN en Espa ol enAtlanta. "Hay un brote medio raro de gripe en México", me dicen, y mepiden una entrevista para el noticiero de las 9 de la ma ana.Inmediatamente me viene a la mente una noticia que circuló sin mayorimpacto unos días antes, en la que se informaba que se habíanidentificado 8 casos de gripe en el sur de Estados Unidos, gripesproducidas por un tipo de virus de cerdo que nunca antes habíaninfectado al ser humano.
Triatoma melanosoma, novo status para Triatoma infestans melanosoma Martinez, Olmedo & Carcavallo, 1987 (Hemiptera: Reduviidae)
Lent, Herman;Jurberg, José;Galv?o, Cleber;Carcavallo, Rodolfo Ubaldo;
Memórias do Instituto Oswaldo Cruz , 1994, DOI: 10.1590/S0074-02761994000300009
Abstract: triatoma infestans melanosoma was described in 1987 by martinez, olmedo & carcavallo. in the present work the authors make a redescription, adding new characters, and based on biological and morphological aspects raise up to the level of species and being identified as triatoma melanosoma. a detailed morphological study of the external male genitalia was made.
Leishmania mexicana infection of the eyelid in a traveler to Belize
Vinetz, Joseph M.;Soong, Lynn;
Brazilian Journal of Infectious Diseases , 2006, DOI: 10.1590/S1413-86702006000400016
Abstract: a 50 year-old man, a united states resident, presented in texas with a violaceous non-ulcerating lesion, involving the entire lower eyelid. the patient had traveled to a jungle area of belize several hours drive from the capital city. leishmania mexicana was isolated. the lesion only partially resolved after an initial course of sodium stibogluconate, requiring retreatment. at two years of follow-up, there was no relapse. the parasite isolated from the patient caused a progressive, non-ulcerating lesion in an experimental mouse footpad infection. this is an unusual case of cutaneous leishmaniasis in a traveler. travelers must be educated about personal protective measures to prevent exotic infections acquired during travel.
Leishmania mexicana infection of the eyelid in a traveler to Belize
Vinetz, Joseph M.;Soong, Lynn;
Brazilian Journal of Infectious Diseases , 2007, DOI: 10.1590/S1413-86702007000100030
Abstract: a 50 year-old man, a united states resident, presented in texas with a violaceous non-ulcerating lesion, involving the entire lower eyelid. the patient had traveled to a jungle area of belize several hours drive from the capital city. leishmania mexicana was isolated. the lesion only partially resolved after an initial course of sodium stibogluconate, requiring retreatment. at two years of follow-up, there was no relapse. the parasite isolated from the patient caused a progressive, non-ulcerating lesion in an experimental mouse footpad infection. this is an unusual case of cutaneous leishmaniasis in a traveler. travelers must be educated about personal protective measures to prevent exotic infections acquired during travel.
Del colonialismo al colaboracionismo-dialógico-crítico: una aproximación a la dimensión política y reflexiva de la antropología en México
Rafael Hernández Espinosa
AIBR : Revista de Antropología Iberoamericana , 2007,
Abstract: El presente texto reflexiona sobre las transformaciones de la antropología mexicana en cuanto a las implicaciones políticas y epistemológicas en las relaciones con los actores sociales. Se identifican tres etapas, colonialista, crítica-marxista y dialógica-crítica, en las cuales estas implicaciones son particulares. La última de ellas involucra posturas complejas y alternativas a partir de una doble reflexividad concerniente en un enfoque crítico sobre el posicionamiento político del investigador y sobre la comprensión intercultural de los fenómenos.
Biological aspects of crosses between Triatoma maculata (Erichson, 1848) and Triatoma pseudomaculata Corrêa & Espínola, 1964 (Hemiptera: Reduviidae)
Belisário, Carlota Josefovicz;Pessoa, Grasielle Caldas D'ávila;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000029
Abstract: due to morphological similarities between triatoma maculata and t. pseudomaculata, which comprise the "maculate complex", both had been regarded as the same species until 1964. considering that the studies on triatomine hybridization permit hypotheses formulation concerning origin and divergence of species, enabling a quantitative analysis of taxonomic relationships between species, the present investigation was aimed at broadening further understanding related to the capacity of hybrid production by determining the degree of reproductive isolation between t. maculata and t. pseudomaculata. our results have demonstrated that t. maculata and t. pseudomaculata showed no differences regarding reproduction patterns and they are able to cross, generating infertile hybrids.
Início da atividade de v?o em Triatoma infestans (Klug, 1834) e T. melanosoma Martínez, Olmedo & Carcavallo, 1987 (Hemiptera, Reduviidae)
Galv?o, Cleber;Rocha, Dayse da Silva;Jurberg, José;Carcavallo, Rodolfo;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000100017
Abstract: the flight initiation of t. infestans, the main vector of chagas disease in the southern cone countries of latin america, and of the closely-related species t. melanosoma was studied in laboratory. the results demonstrated that after the beginning of observations the peak of the flight activity was about 14 days after feeding in both species and it was usually more marked in the females than in the males, but there were no significant differences in the flight behaviour of the two species.
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