title: Detection of sulphate-reducing bacteria in human saliva.
abstract: OBJECTIVE
  The aim of the current study was to investigate the presence of sulphate-reducing bacteria (SRB) in human saliva and correlate with oral and systemic conditions.
  
  
  METHODS
  Saliva samples were collected from 118 patients and inoculated in 2 ml of modified Postgate's E medium culture. After 28 days of incubation at 30°C the presence of SRB was identified by the production of sulphide.
  
  
  RESULTS
  Of 118 saliva samples collected, 35 were positive for the presence of SRB. Three positive samples were randomly chosen to identify the species of SRB by PCR and sequenced. The three selected samples were identified as Desulfovibrio fairfieldensis, Desulfovibrio desulfuricans and Raoultella ornithinolytica. Gastritis (14.4%) was the most prevalent systemic disease, followed by diabetes (3.4%), while periodontitis (11%) and traumatic fibroma (4.2%) were the oral manifestations most frequently found. A bivariate analysis was performed to examine for the presence of SRB and the most prevalent systemic and oral manifestations. Only periodontitis showed a statistically significant association (p = 0.0003).
  
  
  CONCLUSIONS
  The results showed SRB can be found in oral microbiota of healthy patients. Regarding the several conditions studied, there was a higher prevalence of SRB in patients with gastritis and patients with periodontal disease, with a possible correlation between the presence of SRB in the oral microbiota and periodontal disease.
authors: Fluminense Federal University , Rio de Janeiro , Brazil.
authors: Fabiano Luiz
authors: FL
authors: Heggendorn
authors: Lucio Souza
authors: LS
authors: Gonçalves
authors: Eliane Pedra
authors: EP
authors: Dias
authors: Arley
authors: A
authors: Silva Junior
authors: Mariana Machado
authors: MM
authors: Galvão
authors: Márcia T S
authors: MT
authors: Lutterbach
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D002648:Child; D017931:DNA Primers; D006801:Humans; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012463:Saliva / Q000382:microbiology*; D013045:Species Specificity; D016999:Sulfur-Reducing Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D055815:Young Adult
chemical_list: D017931:DNA Primers; D012336:RNA, Ribosomal, 16S