Anaerobic bacteria and intrahepatic stones: Detections of Clostridium sp. and Bacteroides fragilis

Yanlei Liu, Kan Lam, Yajarayma J. Tang, Paul H. Gumerlock, Dong Ki Lee, Myung Hwa Kim, Sum P. Lee, Joseph Silva, Joseph Leung

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Objective: To detect anaerobic bacteria Clostridium sp. and Bacteroides fragilis in intrahepatic stones by molecular genetic method. Methods: DNA was extracted from 59 stone samples and subjected to polymerase chain reaction (PCR) amplification targeting the 16S rRNA gene of Clostridium sp. and the glutamine synthetase gene of Bacteroides fragilis. Single-strand conformational polymorphism (SSCP) analysis was performed to identify the Clostridium sp. Results: 16S rRNA gene sequences for Clostridium sp. were identified in 49 stones (83%, 49/59). The two most common groups were detected in 19 (41%) and 17 (37%) of the 46 samples using SSPC analysis, and 25/59 (42%) stones were tested positive for Bacteroides fragilis. Conclusions: Anaerobes such as Clostridium sp. and Bacteroides fragilis present in intrahepatic stones and may play a role in stone formation. PCR is a useful technique to detect fastidious pathogens, which are difficult to culture. SSCP of PCR products is a rapid method in differentiating bacterial species.

Original languageEnglish (US)
Pages (from-to)858-861
Number of pages4
JournalChinese Medical Journal
Issue number9
StatePublished - Sep 2000


  • Anaerobic bacteria
  • Intrahepatic stone
  • PCR
  • Single-strand confromational polymorphism

ASJC Scopus subject areas

  • Medicine(all)


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