PubMed · 12986952
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A BENSAUDE, MOLINIER. 1952. [Rectoscopy in amebiasis].. https://pubmed.ncbi.nlm.nih.gov/12986952/
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Microscopic identification of Entameba histolytica in stool is insensitive to differentiate this pathogenic ameba from morphologically identical Entameba dispar. An enzyme-linked immunosorbent assay method was applied for diagnosing amebiasis by detection of E. histolytica antibody. A total of 258 sample sera were analyzed from five different groups including amebiasis patients, E. histolytica/E. dispar asymptomatic cyst carriers, patients clinically presumed to have intestinal and extra-intestinal amebiasis and healthy control. From 51 E. histolytica/E. dispar cysts passers identified by microscopy and culture, a positive anti-amebic antibody was measured only for eight specimens (15.6%) and 43 cyst carriers showed an absorbance less than cut-off likely due to E. dispar infection. These findings suggest usefulness of ELISA method in differentiation of Entameba species, in clinical laboratories less equipped with biological and biochemical methods or antigen capture kits.
The effects of gill abrasion and experimental infection with Tenacibaculum maritimum were assessed in Atlantic salmon Salmo salar with underlying amoebic gill disease. The respiratory and acid-base parameters arterial oxygen tension (P(a)O2), arterial whole blood oxygen content (C(a)O2), arterial pH (pHa), haematocrit and haemoglobin concentrations were measured at intervals over a 48 h recovery period following surgical cannulation of the dorsal aorta. Mortality rates over the recovery period were variable, with gill abrasion and inoculation with T. maritimum causing the highest initial mortality rate and unabraded, uninoculated controls showing the lowest overall mortality rate. Fish with abraded gills tended to show reduced P(a)O2 and lower C(a)O2 compared with unabraded fish. Infection with T. maritimum had no effect on P(a)O2 or C(a)O2. All fish showed an initial alkalosis at 24 h post-surgery/inoculation which was more pronounced in fish inoculated with T. maritimum. There were no significant effects of gill abrasion or infection upon the ratio of oxygen specifically bound to haemoglobin or mean cellular haemoglobin concentration. Histologically, 48 h following surgery, abraded gills showed multifocal hyperplastic lesions with pronounced branchial congestion and telangiectasis, and those inoculated with T. maritimum exhibited focal areas of branchial necrosis and erosion associated with filamentous bacterial mats. All fish examined showed signs of amoebic gill disease with multifocal hyperplastic and spongious lesions with parasome-containing amoeba associated with the gill epithelium. The results suggest that respiratory compromise occurred as a consequence of gill abrasion rather than infection with T. maritimum.
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