The influence of endoscopic procedures upon the contamination of Helicobacter pylori cultures.
BACKGROUND
Among the various diagnostic methods for the detection of Helicobacter pylori infection, histological examination and microbiological processing of gastric biopsy samples are assumed to be the gold standard techniques.


OBJECTIVE
Since H. pylori culture can be affected by the presence of non-H. pylori bacteria, we evaluated the efficacy of endoscope disinfection and the influence of endoscopic procedures on culture contamination.


METHODS
The procedures used during the first two routine endoscopies were evaluated during 28 consecutive days. Endoscopy room, forceps and endoscopic channel were analyzed before and after the beginning of normal procedures. After disinfection, a biopsy simulation was performed to verify the gastric bacteria.


RESULTS
Endoscope disinfection removed all organisms from forceps and endoscopic channel with 100% efficacy. The most frequent non-H. pylori bacteria detected were Streptococcus bovis, Enterobacter hormaechei, and Staphylococcus aureus. The sensibility of the H. pylori culture was affected by the presence of non-H. pylori bacteria.


CONCLUSIONS
The risk of transmission of microorganisms was not detectable when sterilized biopsy forceps and stringent disinfection standards were employed. Whilst S. bovis and E. hormaechei may be common in gastric microbial flora, the presence of P. aeruginosa and S. aureus indicated that the manipulation of biopsies could be responsible for culture contamination with these bacteria.
Ribeiro
Marcelo L
ML
Clinical Pharmacology and Gastroenterology Unit, Sao Francisco University Medical School, Bragança Paulista, SP, Brazil.
Godoy
Anita P O
AP
Benvengo
Yune H B
YH
Ecclissato
Christina C
CC
Mendonça
Sergio
S
Pedrazzoli
José
J
D000818:Animals; D001706:Biopsy; D002478:Cells, Cultured; D004203:Disinfection; D020776:Endoscopes, Gastrointestinal / Q000382:microbiology*; D016099:Endoscopy, Gastrointestinal / Q000009:adverse effects; D004866:Equipment Contamination; D016481:Helicobacter Infections / Q000635:transmission*; D016480:Helicobacter pylori / Q000254:growth & development*; D006801:Humans; D012756:Sheep