clostridium difficile has been recognized as the major cause of pseudomembranous colitis.this bacterium produces two toxins(an enterotoxin -cytotoxin and a potent cytotoxin called toxin A and toxin B erespectively).these toxins have implicated in pathogenesis of the disease.however,histopathological effects of their molecular mass less than 100KDa have been essayed.in the persent study,we exami...

The myoelectric response of the rabbit ileum was studied in response to live Vibrio cholerae culture, a whole cell lysate of cholera, and the purified enterotoxin. Each cholera preparation produced a series of highly organized migrating action potential complexes (MAPC). An MAPC was defined as action potential discharge with a duration of 2.5 s or longer, followed by similar activity on at leas...

OBJECTIVE Vibrio cholerae (V. cholerae) causes a potentially lethal disease named cholera. The cholera enterotoxin (CT) is a major virulence factor of V. cholerae. In addition to CT, V. cholerae produces other putative toxins, such as the zonula occludens toxin (Zot) and accessory cholera enterotoxin (Ace). The ace gene is the third gene of the V. cholerae virulence cassette. The Ace toxin alte...

The ligated loop of the rabbit intestine was investigated as a possible experimental model for the study of Clostridium perfringens food poisoning. The method of preparation of the challenge inoculum was important in determining whether a given strain would provoke a response. When cultures were grown for 4 hr at 37 C in Skim Milk (Difco), 14 of 29 type A strains isolated from food-poisoning ou...

Twenty Salmonella Gallinarum strains isolated from poultry were tested for Enterotoxigenicity activity using rabbit and chicken ligated intestine loop technique and the rabbit vascular permeability factor activity test. One ml of cell-free filtrate (CFF) of each isolate was injected into chicken ligated loops and rabbit ligated loops, one ml of whole cell culture(WCC) of each isolate was inject...

To evaluate the role of aerobactin production in the virulence of Shigella flexneri, a iuc::Tn10 insertion mutant was obtained from strain M90T, a serotype 5 isolate. This mutant was tested for its ability to invade and kill HeLa cells in monolayers, to elicit keratoconjunctivitis in guinea pigs and to infect ligated segments of rabbit ileal loops. Although this mutant did not grow in iron-depl...

Three techniques for using the dog as an assay organism for Clostridium perfringens enterotoxin are described. These are believed to be more convenient than ligated ileal-loop procedures.

It is known that the major etiologic agent of pseudomembranous colitis in man is Clostridium difficile. With respect to traditional use of almond paste in the treatment of infantile diarrhea, we studied the effects of the aqueous extract of Amygdalus communis (AEAC) on the growth and toxin production of Clostridium difficile in culture medium and the rabbit ligated ileal loop. Three groups...

Details for the preparation and partial purification of culture supernatant fluids of Vibrio cholerae (V. comma) 569B which retain rabbit ileal loop fluid-accumulating activity are presented. These preparations were fractionated on Sephadex G-200 and on diethylaminoethyl-Sephadex. On the latter, two fractions were obtained by elution with a linear sodium chloride gradient. The fraction designat...

Forty-three strains of Yersinia enterocolitica isolated from children with gastroenteritis and 18 laboratory strains were examined for enterotoxin production by using the infant mouse, Y1 adrenal cell, and rabbit ileal loop assay systems. All clinical isolates and seven laboratory strains were found enterotoxigenic in the infant mouse model, but none of the strains produced toxin in the Y1 adre...