title: Decreased competiveness of the foodborne pathogen Campylobacter jejuni during Co-culture with the hyper-ammonia producing anaerobe Clostridium aminophilum.
abstract: Campylobacter spp. are a leading bacterial cause of human foodborne illness. When cocultured in anaerobic Bolton broth with the hyper-ammonia producing bacterium, Clostridium aminophilum, ammonia accumulation was greater and final growth of Campylobacter jejuni was reduced (CFU>or=1.4 log10/mL) compared to that obtained by pure culture controls. Co-culture with the less active ammonia-producing saccharolytic Prevotella albensis had no effect on final C. jejuni concentrations. When co-cultured similarly except with the addition of 10 micromol/L monensin, monensin-susceptible Cl. aminophilum was reduced by 2 to 4 log10 CFU/mL and concentrations of C. jejuni, which is insensitive to monensin, did not differ from its pure culture control. These results suggest that in the absence of added monensin, the hyper ammonia-producing Cl. aminophilum may be able to outcompete asaccharolytic C. jejuni for amino acid substrates and that this competitive ability was eliminated by addition on monensin.
authors.affiliation: Food & Feed Safety Research Unit, United States Department of Agriculture, Agricultural Research Service, College Station, Texas 77845, USA. Robin.Anderson@ars.usda.gov
authors.forename: R C
authors.initials: RC
authors.lastname: Anderson
authors.forename: M D
authors.initials: MD
authors.lastname: Flythe
authors.forename: N A
authors.initials: NA
authors.lastname: Krueger
authors.forename: T R
authors.initials: TR
authors.lastname: Callaway
authors.forename: T S
authors.initials: TS
authors.lastname: Edrington
authors.forename: R B
authors.initials: RB
authors.lastname: Harvey
authors.forename: D J
authors.initials: DJ
authors.lastname: Nisbet
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000898:Antibiosis; D016123:Campylobacter jejuni / Q000254:growth & development / Q000502:physiology*; D003013:Clostridium / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D018920:Coculture Techniques; D015169:Colony Count, Microbial; D003470:Culture Media / Q000737:chemistry; D006801:Humans; D008985:Monensin / Q000494:pharmacology; D018720:Prevotella / Q000254:growth & development / Q000378:metabolism / Q000502:physiology
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D000641:Ammonia; D008985:Monensin