ABSTRACT
T. pallidipennis was found naturally infected in localities of domestic, peridomestic and wild areas in the State of Morelos, México. In agreement with the triatomines high potentiality like vectors of T. cruzi, protozoan that causes Chagasïdisease and the Knowledge of these bugs in México, the aim of the present research was to collect triatomines for assessment of T. cruzi infection, to characterize and compare life cycles, identification of feeding preferences and observe indexes of experimental infectivity. Seven isolates of T. cruzi were obtained, from differents localities which curves of parasites showed different behaviors. Histopathological study, carried out by counting of amastigotes nests, which affected the gastrocnemius muscle and heard was observed. The life cycles of T. pallidipennis was completed in 131 days. The feeding preferences were rats, cats and pigs
Subject(s)
Animals , Insect Vectors , Triatoma , Trypanosoma cruzi , Chagas Disease , Feeding Behavior , Insect Vectors , Intestines , Life Cycle Stages , Mexico , Triatoma , Trypanosoma cruziABSTRACT
The purpose of this paper is to show up the importance of the standardization concepts in american trypanosomiasis epidemiological studies. The consistence in the measurement of some dwelling characteristics was evaluated. A validation of the queretaro antigen for indirect hemagglutination reaction as a diagnostic test and the interobserver concordance for the serologic readings were also made. The observers were instructed in some sessions. The pretests were made in the laboratory with positive and negative sera, with sera from the studied population. Results show that the interobserver concordance after the instruction, for the dwelling variables ranged from 70 percent to 100 percent. Sensitivity of the queretaro antigen was 100 percent, specificity 55 percent, the predictive value of a positive test 55 percent, and the predictive value of a negative test 93 percent. The interobserver concordance was 47 percent. The pretest and the pilot study are very important in getting the objetives of the principal study
Subject(s)
Humans , Chagas Disease/diagnosis , Trypanosoma cruzi/isolation & purification , Antigens, Protozoan , Chagas Disease/parasitology , Housing , Predictive Value of Tests , Hemagglutination Tests , Serologic Tests , Trypanosoma cruzi/immunology , Trypanosoma cruzi/pathogenicityABSTRACT
A seasonal research was carried out in Irapuato, Guanajuato and Zamora, Michaocan, Mexico, the location of the most important producers of strawberries, in order to assess fecal contamination through the findig of protozoan cysts and helminth eggs, specifically of Taenia sp eggs. Three techniques were used: direct observation, flotation and sedimentation. Low numbers of protozoan cysts and only one Ascaris egg were found. What is most interesting is that no Taenia eggs were identified. Results indicate that although strawberries are contaminated with human feces, contamination is minimal
Subject(s)
Agricultural Irrigation , Water Pollution/adverse effects , Drainage, Sanitary , Fruit/parasitology , Parasitic Diseases/etiology , Parasitology , Wastewater/adverse effects , Water Pollutants/adverse effectsABSTRACT
It was determined the presence of posoncospheres in muscular tissues in 20 natural cysticercotic pigs and in 20 pigs apparently free of taenia solium metacestodes. Ten differents anatomical regions were dissected, giving 400 samples in total. The animals were slaugthered in Ecatepec, México State, México. The samples were kept in bottles with saline and were processed in the Laboratorio de Biología de Parásitos, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM); cysticercus were counted and later on the resulting muscular mass was grinded and observations were made in the sediment for posoncospheres search. Mann-Withney statistical method revealed meaningful differences between postoncospheres in cysticercotic pigs and not apparently cysticercotic pigs. The linear correlation analysis showed no relation between cysticercus quantity and postoncospheres quantity in the same samples. Postoncospheres were found in cysticercotic animals and in those apparently free of cysticercus, in the last group the quantity was bigger
Subject(s)
Animals , Cysticercosis/parasitology , Muscles/parasitology , Swine/parasitology , Taenia/isolation & purification , Cysticercosis/transmission , Meat/parasitology , Mexico/epidemiology , Parasite Egg Count/statistics & numerical data , Sampling Studies , Isotonic Solutions , Data Interpretation, Statistical , Taenia/pathogenicityABSTRACT
Se comunica un brote epidémico de Larva migrans cutánea, posterior a lluvias intensas al paso del huracán Celia, en siete estudiantes y un profesor de la Facultad de Ciencias. El diagnóstico se estableció clínicamente; se realizaron frotes sanguíneos para cuantificación de eosinófilos. Fueron tratados con albendazol a dosis convencionales y tiabendazol tópico