GI Diarrhea and Other2

GI Diarrhea and Other2 - invasive properties of the strain...

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GI Diarrhea and Others 2.5. Enteroaggretative (EaggEC) a newly described pathogen found in many parts of the world, causes disease by attachment of the organism to the small intestine and subsequent damage to the mucosal lining. 3. Fecal leukocytes A particularly useful technique to establish a presumptive diagnosis in infectious diarrhea is microscopic examination of the stool (see Table 2). Using two drops of Loeffler’s methylene blue mixed with a small amount of stool on a slide, a search for leukocytes and erythrocytes is undertaken. (An experienced observer can do the examination without the stain, thereby looking for protozoa and other parasites on the same slide.) Invasive pathogens such as Shigella and Campylobacter produce a “sea of polys,” easily visible on every coverslip, as well as red blood cells. The toxigenic organisms, viruses and food poisoning bacteria cause a watery stool that harbors very few formed eleme Certain organisms produce variable findings on microscopic stool examination, depending on the
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Unformatted text preview: invasive properties of the strain and the degree of colonic involvement. This category includes Salmonella, Yersinia and V. parahaemolyticus. Pseudomembranous colitis and antibiotic-associated diarrhea, caused by Clostridium difficile, have unpredictable findings with regard to cellular elements in the stool. Most cases show a profusion of sloughed epithelial and red blood cells, but only rare polymorphonuclear leukocytes. An acute exacerbation of ulcerative colitis can produce a great discharge of leukocytes and erythrocytes into the stool, resulting in an exudative microscopic appearance that resembles bacillary dysentery. While the fecal microscopic examination is neither infallible nor even helpful in all cases, it is cheap and it does yield immediate information that can guide antibiotic therapy, especially in cases of bacillary dysentery....
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This note was uploaded on 03/02/2012 for the course BSC BSC1086 taught by Professor Joystewart during the Fall '10 term at Broward College.

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