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Foodborne pathogen  Campylobacter jejuni  has been associated with ruminants. The objectives of this experiment were to determine  C. jejuni  survivability in mixed  in vitro  rumen microbial populations and the impact on methane production with or without methane inhibitors 2-bromosulfonate (BES) and/or sodium nitrate. When inoculated into rumen microbial populations without or with 0.5 mM BES, 5.0 mM nitrate or their combination,  C. jejuni  viability decreased from 4.7 ± 0.1 log 10  colony forming units (CFU)/mL after 24 h. Loss of  C. jejuni  viability was greater ( P  &lt; 0.05) when incubated under 100% CO 2  compared to 50% H 2 :50% CO 2 , decreasing 1.46  versus  1.15 log units, respectively.  C. jejuni  viability was also decreased ( P  &lt; 0.05) by more than 0.43 log units by the anti-methanogen treatments. Rumen microbial populations produced less methane ( P  = 0.05) when incubated with than without  C. jejuni  regardless of whether under 100% CO 2  or 50% H 2 :50% CO 2 . For either gas phase, nitrate was decreased (13.2  versus  37.9%) by the anti-methanogen treatments versus controls although not always significant.  C. jejuni -inoculated populations metabolized 16.4% more ( P  &lt; 0.05) nitrate under H 2 :CO 2versus  100% CO 2 . Apparently,  C. jejuni  can compete for H 2  with methanogens but has limited survivability under rumen conditions.

Survival of Campylobacter jejuni during in vitro culture with mixed bovine ruminal microorganisms in the presence of methanogen inhibitors