Navegando por Assunto "Entamoeba dispar"

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Acesso aberto (Open Access)
Estudo epidemiológico da amebíase no Estado do Pará utilizando diferentes metodologias para diagnóstico
(Universidade Federal do Pará, 2005) SILVA, Mônica Cristina de Moraes; PÓVOA, Marinete Marins; http://lattes.cnpq.br/2256328599939923
The amebiasis epidemiology had been evaluated since the E. histolytica (pathogenic) was differentiated from E. dispar (non-pathogenic). In this study, it had investigated the amebiasis frequency in residents from Pará using different diagnostic techniques and evaluated the parasite pathogenesis. All participants (n = 845) had given their fecal material and from them, 191 were asked about the symptoms of diarrhea, abdomen pain, constipation, nausea and vomit. We had also analyzed 8 liver exudates from patients suspected of hepatic amebiasis. All samples were examined by microscopy and the E. histolytica confirmation was done by antigen detection (E. histolytica Test. TechLab). Of the total, 98 fecal samples and all exudates were cultured in Pavlova medium for parasite isolation and biochemical characterization and molecular (species identification and genotyping of the locus 1-2). Strains from other Brazil regions were also genotyped. The positive rate for E. histolytica found was 29.35% (248/845) and there was no correlation with age. The sensitivity of the microscopy method was low (45.26% - 74/334) and the specificity high (87.03% - 260/334) when compared to the ELISA test. The correlation between presence of symptoms and ELISA positive results was significant (OR 4.4026) with the diarrhea and abdominal pain being the most reported. None of the exudate samples was positive under the microscopy, but 7 of them were ELISA positive. We had success in culturing only 22 fecal samples. The characterization of HE was possible only for 13 isolates, from which, 7 were E. histolytica and 6 E. dispar. The DNA of the 22 isolates and all exudates were tested by PCR for the species identification and genotyping. Of the total, 16 strains (9 mixed, 4 E. dispar and 3 E. histolytica) and 5 exudate had amplified at the PCR. The genotyping had identified additional positivity for E. histolytica in one exudate and showed different length polymorphisms for the locus 1-2 de E. histolytica and E. dispar of Pará and other Brazil regions and one case of co-infection by different genotypes of the E. dispar. Our results had showed that the invasive amebiasis is an important public health problem within the Amazonian population and that the high genotype variability of E. histolytica contribute for the maintenance of this disease in Brazil.
Acesso aberto (Open Access)
Investigação da prevalência da amebíase em escolares do município de Imperatriz-MA
(Universidade Federal do Pará, 2012) BELFORT, Marcia Guelma Santos; ISHIKAWA, Edna Aoba Yassui; http://lattes.cnpq.br/3074963539505872
Amoebiasis is an infection caused by Entamoeba histolytica and an important cause of morbidity and mortality worldwide. Studies have reported a high prevalence of in tropic amebiasis al regions, especially in communities living in poor sanitary conditions. The epidemiological study of amoebiasis has been reevaluated since E. histolytica, pathogenic form, was distinct from E. dispar, non-pathogenic form. The aim of this study was to estimate the prevalence of E. histolytica in the population of the municipal city Imperatriz (MA). We conducted a cross-sectional study involving 405 students. By the screening of the complex E. histolytica / E.dispar parasitological examination was performed using the sedimentation method. The positive samples for E.histolytica/ E.dispar complex were subjected to polymerase chain reaction (PCR) for species differentiation. For initial amplification by the PCR we used a outer primer set E1 and E2 that amplified a 1076 bp fragment and followed by a multiplex PCR using inner primer set Ed-L/Ed-R and Eh-L/Eh-R E.histolytica and E.dispar respectively. No sample showing positivity for E. histolytica The prevalence of E.dispar in the population was 2.7% (11/405). The PCR proved important tool for the differential diagnosis of Entamoebas. However, studies on the prevalence of amoebiasis should be conducted in population with different characteristics, in order to contribute effectively to define the epidemiological situation of this infection in Imperatriz city.