pubmed.ncbi.nlm.nih.gov

Evaluation of DNA probes for detection of Shiga-like-toxin-producing Escherichia coli in food and calf fecal samples - PubMed

Evaluation of DNA probes for detection of Shiga-like-toxin-producing Escherichia coli in food and calf fecal samples

M Samadpour et al. Appl Environ Microbiol. 1990 May.

Abstract

The use of DNA probes for Shiga-like toxin I (SLT-I) and SLT-II for detection of SLT-producing Escherichia coli (SLTEC) in foods and calf fecal samples was evaluated. Enrichment cultures were prepared from food or fecal samples. Colonies formed by plating of enrichment cultures were probed for SLTEC by colony hybridization. Alternatively, enrichment cultures were analyzed for SLTEC presence by dot blot. The lowest detected concentration of SLTEC in sample homogenates inoculated with E. coli O157:H7 corresponded to 1.3 CFU/g of sample. Of the 44 food samples and 28 fecal samples from dairy calves tested by the colony hybridization method, 4 food samples, including ground beef, raw goat milk, blueberries, and surimi-based delicatessen salad, and 9 calf fecal samples were positive with the SLT probes. The dot blot technique yielded results within 48 h and can be used as a fast and sensitive method of detection for SLTEC in foods and calf fecal samples. The colony hybridization technique took 3 to 4 days but permits recovery of the positive colonies when desired.

PubMed Disclaimer

Similar articles

Cited by

References

    1. J Clin Microbiol. 1980 Sep;12(3):361-6 - PubMed
    1. N Engl J Med. 1983 Mar 24;308(12):681-5 - PubMed
    1. Anal Biochem. 1983 Jul 1;132(1):6-13 - PubMed
    1. Plasmid. 1983 Nov;10(3):296-8 - PubMed
    1. Ann Intern Med. 1984 Dec;101(6):738-42 - PubMed

Publication types

MeSH terms

Substances