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. 1982 Jun;43(6):1343–1353. doi: 10.1128/aem.43.6.1343-1353.1982

Recovery of Campylobacter jejuni and Campylobacter coli from inoculated foods by selective enrichment.

M P Doyle, D J Roman
PMCID: PMC244238  PMID: 7103488

Abstract

A direct enrichment procedure was developed to selectively recover small numbers of Campylobacter jejuni, C. coli, and nalidixic acid-resistant thermophilic Campylobacter from foods. The procedure includes an enrichment medium composed of brucella broth, 7% lysed horse blood, 0.3% sodium succinate, 0.01% cysteine hydrochloride, vancomycin (15 micrograms/ml), trimethoprim (5 micrograms/ml), polymyxin B (20 IU/ml), and cycloheximide (50 micrograms/ml) that is inoculated with 10 or 25 g of food and incubated with agitation under microaerophilic conditions at 42 degrees C for 16 to 18 h. After incubation, the medium is plated directly onto Campy-BAP agar plates (M. J. Blaser et al., Ann. Intern. Med. 91:179-185, 1979), and resulting colonies that resemble Campylobacter are identified by conventional tests. The foods evaluated included raw milk, hamburger, and chicken skin which had aerobic plate counts of 10(5) to 10(9) bacteria/g. The procedure was effective in recovering as few as 0.1 cell of Campylobacter per g of food. Of the 50 isolates of Campylobacter evaluated, all were recovered from raw milk and hamburger at a level of 1 to 4 cells/g, and 41 and 40 isolaes were recovered from the hamburger and milk, respectively, at 0.1 to 0.4 cell/g. The enrichment was least effective for recovering campylobacters from chicken skin, as 7 and 26 of 50 isolates were not recovered at 1 to 4 and 0.1 to 0.4 cell/g, respectively. This new procedure is more rapid, direct, and effective than other enrichment or direct plating procedures for recovering small numbers of campylobacters from foods.

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Selected References

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