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A study was undertaken to compare several enrichment and direct isolation media for their suitability to detect and enumerate five strains of Campylobacter jejuni in refrigerated (5 degrees C) chicken meat. The influence of CO2 on survival at 5 degrees C was also investigated. Selective enrichment media evaluated included Preston broth (PB), selective semisolid brucella medium (SSBM), Campylobacter enrichment broth (CEB), VTP brucella-FBP broth (VTP), Rosef and Kapperud Campylobacter enrichment broth (RKCEB), and Doyle and Roman enrichment broth (DREB). Direct isolation agars included Campy brucella agar (CBAP), blood-free Campylobacter medium (BFCM) and modified Butzler agar (MBA). Comminuted chicken meat was inoculated with C. jejuni, sealed under atmospheric gas or CO2, and stored at 5 degrees C for up to 21 days. Viable population was determined by the most-probable-number technique (PB, SSBM, CEB, VTP, and RKCEB, followed by plating on CBAP, BFCM, and MBA), enrichment on DREB, followed by plating on CBAP, BFCM, and MBA, and direct isolation on CBAP, BFCM, and MBA. Without exception, direct plating of samples was superior to the most-probable-number technique for enumerating C. jejuni; MBA was inferior to CBAP and BFCM, and DREB performed at least as well as other enrichment media evaluated. Carbon dioxide afforded protection against death of three of the five strains of C. jejuni tested.

Efficacy of media and methods for detecting and enumerating Campylobacter jejuni in refrigerated chicken meat