Abstract:One hundred and seventy-seven Escherichia coli strains isolated from food, pigs and humans were tested for the production of heat-labile and heat-stable enterotoxin at 4, 22, and 37 degrees C. Heat-labile enterotoxin was detected in culture supernatants by an enzyme-linked immunosorbent assay, and heat-stable enterotoxin by the infant mouse bioassay. Thirty strains produced heat-labile enterotoxin, and twenty heat-stable enterotoxin. None of the strains isolated from food were enterotoxigenic. Fifty-seven per … Show more
“…Enterotoxin assays. Heat-labile enterotoxin (LT) was detected by a four-layer sandwich enzyme-linked immunosorbent assay (ELISA) as described previously (26,27). Heat-stable enterotoxins were assayed by the infant mouse assay (STa) according to Dean el al.…”
Enterotoxigenic Escherichia coli of human and porcine origin were characterized with respect to their O and H antigens, fimbrial antigens, and type of enterotoxin produced. Enterotoxin production was determimed by bioassay (infant mice) and enzyme‐linked immunoassay (ELISA). The presence of genes coding for the enterotoxins was determined by DNA‐DNA hybridization. The number and molecular size of plasmids in the enterotoxigenic strains were determined by gel electrophoresis. Strains with the same serological pattern showed different plasmid profiles and could thereby easily be separated. One strain of porcine origin possessed only one plasmid, but produced both heat‐labile enterotoxin and the F4 antigen (formerly K88), which is an unusual combination.
“…Enterotoxin assays. Heat-labile enterotoxin (LT) was detected by a four-layer sandwich enzyme-linked immunosorbent assay (ELISA) as described previously (26,27). Heat-stable enterotoxins were assayed by the infant mouse assay (STa) according to Dean el al.…”
Enterotoxigenic Escherichia coli of human and porcine origin were characterized with respect to their O and H antigens, fimbrial antigens, and type of enterotoxin produced. Enterotoxin production was determimed by bioassay (infant mice) and enzyme‐linked immunoassay (ELISA). The presence of genes coding for the enterotoxins was determined by DNA‐DNA hybridization. The number and molecular size of plasmids in the enterotoxigenic strains were determined by gel electrophoresis. Strains with the same serological pattern showed different plasmid profiles and could thereby easily be separated. One strain of porcine origin possessed only one plasmid, but produced both heat‐labile enterotoxin and the F4 antigen (formerly K88), which is an unusual combination.
This datasheet on Escherichia coli ETEC as a foodborne pathogen covers Identity, Overview, Associated Diseases, Pests or Pathogens, Risk Assessment, Diagnosis, Epidemiology, Uses, Food Safety, Economics, Further Information.
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