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Blastocystis hominis: o enigma continua
Devera Rodolfo
Revista da Sociedade Brasileira de Medicina Tropical , 1998,
Abstract:
Gergorio Volcán
Devera Rodolfo
Revista da Sociedade Brasileira de Medicina Tropical , 2005,
Abstract:
Fauna flebotomínica (Díptera, Psychodidae, Phlebotominae) do Estado Bolívar, Venezuela
González, Ricardo;Devera, Rodolfo;
Revista da Sociedade Brasileira de Medicina Tropical , 1999, DOI: 10.1590/S0037-86821999000600016
Abstract: a descriptive study is presented of sand-fly fauna in bolivar state, venezuela. identification was made of 2,364 sand-flies belonging to 18 species. the vectors of american cutaneous leishmaniasis in the different geographic regions of bolivar state are possibly l. anduzei, l. wellcomei and l. squamiventris in the south, and l. flaviscutellata and l. gomezi in the north.
Fauna flebotomínica (Díptera, Psychodidae, Phlebotominae) do Estado Bolívar, Venezuela
González Ricardo,Devera Rodolfo
Revista da Sociedade Brasileira de Medicina Tropical , 1999,
Abstract: Foi feito um estudo para conhecer a fauna flebotomínica do Estado Bolívar, Venezuela. Foram identificados 2364 flebotomíneos distribuídos em 18 espécies. As espécies que podem estar participando da transmiss o da Leishmaniose tegumentar americana no Estado Bolívar s o possivelmente Lutzomyia anduzei, L. wellcomei e L. squamiventris ao Sul do estado, e L. flaviscutellata e L. gomezi as espécies transmissoras ao Norte.
Should Trypanosoma cruzi be called "cruzi" complex? A review of the parasite diversity and the potential of selecting population after in Vitro culturing and mice infection
Devera, Rodolfo;Fernandes, Octavio;Coura, José Rodrigues;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000100001
Abstract: morpho-biological diversity of trypanosoma cruzi has been known since chagas' first works in 1909. several further studies confirmed the morphological differences among the parasite strains, which were isolated from different reservoirs and vectors, as well as from human beings. in the early sixties, antigenic differences were found in the parasite strains from various sources. these differences, coupled to the observation of regional variations of the disease, led to the proposal of the term cruzi complex to designate the taxon t. cruzi. since then this protozoan has been typed in distinct biodemes, zymodemes and lineages which were consensually grouped into t. cruzi i, t. cruzi ii and into non-grouped strains. t. cruzi genotypic characterization, initially carried out by schizodeme analysis and more recently by various other techniques, has shown a great diversity of the parasite strains. in fact, t. cruzi is formed by groups of heterogeneous sub-population, which present specific characteristics, including distinct histotropism. the interaction of the different infecting clones of the cruzi complex and the human host will determine the morbidity of the disease.
Elevada prevalencia de Cyclospora cayetanensis en indígenas del estado Bolívar, Venezuela
Devera, Rodolfo;Blanco, Ytalia;Cabello, Eva;
Cadernos de Saúde Pública , 2005, DOI: 10.1590/S0102-311X2005000600025
Abstract: the intestinal coccidioses caused by cryptosporidium parvum, isospora belli, and cyclospora cayetanensis are parasitoses of major medical importance, but many epidemiological aspects of these infections are still unknown in bolívar state, venezuela. to determine the prevalence of intestinal parasites and especially of intestinal coccidiosis, an indigenous population in san antonio de morichal was evaluated from july 2003 to april 2004. stool samples obtained by spontaneous evacuation were preserved in potassium dichromate 2.5% and examined by the formalin-ether concentration method and kinyoun staining. of the 160 indigenous people examined, 92.5% (148 cases) were infected. entamoeba coli (58.8%), ascaris lumbricoides (38.8%), and giardia lamblia (18.8%) were the most prevalent intestinal parasites. coccidiosis prevalence was 13.1%, and cyclosporiasis was the most prevalent with 11.9% (19 cases). one subject with c. parvum oocysts and another with i. belli oocysts were diagnosed. there was no difference according to sex (p > 0.05) and age (c2 = 5.6; f.g. = 6) among individuals infected with c. cayetanensis. of these, two cases had only diarrhea. in conclusion, a high prevalence of intestinal coccidiosis infection was found among indigenous people from this community, with c. cayetanensis as the most prevalent infection.
Parásitos intestinales en la población del Instituto Nacional del Menor, Ciudad Bolívar, Venezuela
Devera,Rodolfo; Ortega,Noenard; Suárez,Marlin;
Revista de la Sociedad Venezolana de Microbiología , 2007,
Abstract: a study to determine the prevalence of intestinal parasites in children and teenagers pertaining to the seven dependencies of the instituto national del menor of ciudad bolivar was made, between the months of june and august 2005. a prevalence of intestinal parasitism of 45.7% (48/105) was determined. there were no differences in relation to sex of the affected. the lower the age, the greater the prevalence of parasitism. the centro de diagnostico y tratamiento de varones was the most affected dependency with 75% of parasitism among its users, followed by the negro primero kindergarten with 53.8% and the home of females with 47.1%. eleven species of enteroparasites were diagnosed, being blastocystis hominis with 26.7% and giardia lamblia with 13.3% the most frequent. of the parasited ones, 66.7% were monoparasited and 33.3% polyparasited. in conclusion, a high prevalence of intestinal parasitism in children and teenagers that form part of the instituto national del menor programs in ciudad bolivar, bolivar state, was determined. the prevalence of intestinal parasitism was independent of age and sex of the evaluated ones. the centro de diagnostico y tratamiento de varones (75%) and negro primero kindergarten (53.8%) were the dependencies where the greater number of cases was diagnosed.
Should Trypanosoma cruzi be called "cruzi" complex? A review of the parasite diversity and the potential of selecting population after in Vitro culturing and mice infection
Devera Rodolfo,Fernandes Octavio,Coura José Rodrigues
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: Morpho-biological diversity of Trypanosoma cruzi has been known since Chagas' first works in 1909. Several further studies confirmed the morphological differences among the parasite strains, which were isolated from different reservoirs and vectors, as well as from human beings. In the early sixties, antigenic differences were found in the parasite strains from various sources. These differences, coupled to the observation of regional variations of the disease, led to the proposal of the term cruzi complex to designate the taxon T. cruzi. Since then this protozoan has been typed in distinct biodemes, zymodemes and lineages which were consensually grouped into T. cruzi I, T. cruzi II and into non-grouped strains. T. cruzi genotypic characterization, initially carried out by schizodeme analysis and more recently by various other techniques, has shown a great diversity of the parasite strains. In fact, T. cruzi is formed by groups of heterogeneous sub-population, which present specific characteristics, including distinct histotropism. The interaction of the different infecting clones of the cruzi complex and the human host will determine the morbidity of the disease.
Parásitos intestinales en lechugas comercializadas en mercados populares y supermercados de Ciudad Bolívar, Estado Bolívar, Venezuela
Devera,Rodolfo; Blanco,Ytalia; González,Hecmil; García,Lisdet;
Revista de la Sociedad Venezolana de Microbiología , 2006,
Abstract: the aim of this study was to evaluate the parasitological contamination of lettuce (lactuca sativa) commercially sold in ciudad bolivar, bolivar state, venezuela. we studied 102 samples of this vegetable (roman, american and native types) from four locals: two supermarkets (i and ii locals), one greengrocer shop (local iii), and one popular market (local iv). each lettuce obtained was submitted to two consecutives washing with sterile distillated water, filtrated and submitted to spontaneous sedimentation for 24 hours and microscopic examination of sediment. also, it was processed by formol-ether method and kinyoun staining. of a total 102 samples, 53.9% were positive for parasitic structures with morphological aspects similar to those of human parasites. the parasites more frequently detected were blastocystis hominis (21.6%), intestinal coccidians (16.7%) and strongyloides stercoralis (15.7%). there was no differences between lettuce types and local of commercially sold and detection of parasitic forms. we concluded that high contamination percentage determine a risk of human infection between consumers of lettuce in ciudad bolívar. we suggest greater enforcement in the sanitary surveillance of this vegetable offered to the population.
Evaluación de un brote de leishmaniasis tegumentaria americana en una comunidad rural del Estado Bolívar, Venezuela
González M., Ricardo;Devera, Rodolfo;Madrid, Claudia;Zghayer, Sudan;
Revista da Sociedade Brasileira de Medicina Tropical , 2000, DOI: 10.1590/S0037-86822000000100005
Abstract: an epidemiological survey based on the montenegro intradermal reaction (idr) was carried out in san jose de hacha, south of the bolivar state, venezuela, on the occasion of an outbreak of american tegumentary leishmaniasis (lta) in that locality. the idr was applied to 121 of the 184 local inhabitants (65.8%), with a 33.9 rate of positive reactions (44/121). the highest percentage of positivity was observed among males (39.5%) (p < 0.05) and among adults, especially in the 31 to 40 year age group (52.4%) (c2 = 18.28; g.l. = 6). with respect to occupation, agriculturist were the most reactive with 69%. of subjects idr positive, in 65.9% (27/41) the reaction areas ranging from 5 to 9 mm. active lesions of lta were identified in 22 inhabitants and scars were detected in only seven cases. it is suggested that san jose de hacha is a recent focus of lta.
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