1887

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Volume 64, Issue 4

Investigation of the effects of pH and bile on the growth of oral strains isolated from patients with inflammatory bowel disease and controls Free

Abstract

is an oral bacterium that is associated with inflammatory bowel disease (IBD). This study examined the impact of pH and bile on the growth of oral strains isolated from patients with IBD and controls. The growth of 58 strains on horse blood agar (HBA) plates following exposure to media with various pH values for different time points was examined. Furthermore, the growth of strains on HBA plates containing different concentrations of ox bile was investigated. Following exposure to pH 2 for 30 min, none of the 58 oral strains grew on HBA plates. Following exposure to pH 3.5 for 30 min, only four of 20 oral strains examined grew on HBA plates, with a log c.f.u. reduction of 0.7–2.5 compared to the same strains without low pH exposure. Exposure to pH 5 for 120 min had minimal effects on growth. Approximately half of the oral strains (55.2 %, 32/58) grew on HBA containing 2 % bile. Bile inhibited the growth of in a dose- and strain-dependent manner. These data suggest that both bacterial and intestinal environmental factors may play a role in the determination of colonization in the different parts of the gastrointestinal tract and that increased gastric pH and reduced intestinal bile may be risk factors for increased gastric and intestinal colonization.

  • Received:
  • Accepted:
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© 2015 The Authors
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/content/journal/jmm/10.1099/jmm.0.000013
2015-04-01
2024-04-26
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Investigation of the effects of pH and bile on the growth of oral Campylobacter concisus strains isolated from patients with inflammatory bowel disease and controls
J. Med. Microbiol. 64, 438 (2015); https://doi.org/10.1099/jmm.0.000013
/content/journal/jmm/10.1099/jmm.0.000013
/content/journal/jmm/10.1099/jmm.0.000013
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