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. 1984 Apr;19(4):498–501. doi: 10.1128/jcm.19.4.498-501.1984

Monoclonal antibody enzyme-linked immunosorbent assay for identification of K99-positive Escherichia coli isolates from calves.

K W Mills, K L Tietze
PMCID: PMC271103  PMID: 6143763

Abstract

For Escherichia coli to produce diarrhea in animals it must possess the ability to attach to the epithelial cells of the intestine and to produce enterotoxins. Tests developed to differentiate pathogenic from nonpathogenic E. coli have relied on detection of adherence structures called pili or detection of the toxins. We utilized a monoclonal antibody to K99 pili in an enzyme-linked immunosorbent assay to detect the presence of K99 pili in E. coli isolated from calves. Twenty-three E. coli isolates that were known to be stable toxin positive were all shown to produce K99 pili. A 100% correlation also was shown between the presence of K99 antigen and production of stable toxin by E. coli isolates. Of the 251 isolates, 245 were negative by K99 enzyme-linked immunosorbent assay and stable toxin assay. The other six were positive on both tests. The enzyme-linked immunosorbent assay also was shown to be specific for K99 pili by antibody-blocking assays. The number of E. coli necessary for detecting K99 pili by enzyme-linked immunosorbent assay was determined to be 3.5 X 10(5) bacteria per ml.

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Selected References

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