Comparison of three enrichment media for the isolation of Campylobacter spp. from foods

Aim: This study compared the performance of three Campylobacter enrichment broths: Bolton broth (BB), Campylobacter Enrichment broth (CEB) and Preston broth (PB). Methods and Results: Pure cultures of target and competitor organisms, and naturally-contaminated food samples, were used to establish the performance of these media. In pure culture the PB supported the growth of the greates t number of strains of Campylobacter spp. but failed to inhibit some compet itor organisms. The CEB showed the opposite result, inhibiting all 15 compe titor organisms used but failing to support the growth of five Campylobacte r strains. By comparison, BB showed the best compromise between inhibition of competitors and growth of Campylobacter. Conclusions: Plates inoculated with BB and CEB food enrichments resulted in more Campylobacter growth than those inoculated with PB, which supported s ignificantly less typical growth (P less than or equal to 0.001). The most common competitor organism isolated from PB was Escherichia coli, and Pseud omonas spp. were frequently isolated from BB and CEB. Both BB and CEB were better than PB for the isolation of Campylobacter from naturally-contaminat ed foods, although BB yielded more confirmed Campylobacter growth than CEB. Significance and Impact of the Study: This study highlighted differences in performance of media used to isolate Campylobacter spp. from foods.