title: A charcoal- and blood-free enrichment broth for isolation and PCR detection of Campylobacter jejuni and Campylobacter coli in chicken.
abstract: The microaerophilic nature of Campylobacter and its requirement of ∼5% O(2) for growth have complicated its recovery from foods. The addition to the enrichment media of oxygen quenchers such as charcoal or blood could interfere with PCR for its detection. In this study, a two-step simple aerobic method for Campylobacter detection is proposed. A modification of the Tran blood-free enrichment broth (BFEB), in which charcoal was excluded from the medium (M-BFEB), was compared with the original formulation and other enrichment broths. Campylobacter jejuni and Campylobacter coli were screened by PCR directly from the enrichment media. Various levels of pure cultures of C. jejuni and C. coli combined with Escherichia coli were inoculated into Preston, Bolton, BFEB, and the modified BFEB (M-BFEB). In addition, Campylobacter was inoculated onto retail purchased chicken skin and recovery was quantified. Rates of recovery after 24 to 48 h of enrichment at 42 °C under aerobic incubation for BFEB and M-BFEB and microaerobic incubations for Preston and Bolton broths were determined. Overall, our results indicated that the most sensitive medium was Bolton's, followed by either BFEB or M-BFEB; the least sensitive was Preston's. M-BFEB was directly coupled to a PCR assay to detect Campylobacter, avoiding intermediate plating. Campylobacter was detected in the presence of up to 10(8) E. coli cells per ml. M-BFEB facilitated detection of both C. jejuni and C. coli artificially inoculated onto chicken skin samples. M-BFEB coupled to PCR is a rapid and attractive alternative for isolation and identification of C. coli and C. jejuni from poultry.
authors.affiliation: Departamento de Microbiología e Inmunología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Apdo. Postal 124-F, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León 66451, México.
authors.forename: Luisa Y
authors.initials: LY
authors.lastname: Solís-Soto
authors.forename: Santos
authors.initials: S
authors.lastname: García
authors.forename: Irene
authors.initials: I
authors.lastname: Wesley
authors.forename: Norma
authors.initials: N
authors.lastname: Heredia
mesh_terms: D000818:Animals; D017000:Campylobacter coli / Q000302:isolation & purification*; D016123:Campylobacter jejuni / Q000302:isolation & purification*; D002645:Chickens / Q000382:microbiology*; D003470:Culture Media / Q000737:chemistry*; D004269:DNA, Bacterial / Q000032:analysis; D005506:Food Contamination / Q000032:analysis; D005516:Food Microbiology; D005784:Gene Amplification; D006801:Humans; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D013696:Temperature; D013997:Time Factors
chemical_list: D003470:Culture Media; D004269:DNA, Bacterial