Facilitated molecular typing of Shigella isolates using ERIC-PCR

Am J Trop Med Hyg. 2012 Jun;86(6):1018-25. doi: 10.4269/ajtmh.2012.11-0671.

Abstract

To evaluate the performance of enterobacterial repetitive intergenic sequence-based polymerase chain reaction (ERIC-PCR) typing versus the current standard for the typing of Shigella pulsed gel electrophoresis (PFGE), we typed 116 Shigella isolates from a village in an endemic setting over a 20-month period using both methods. PFGE identified 37 pulse types and had a discrimination index of 0.925 (95% confidence interval = 0.830-1.00), whereas ERIC-PCR identified 42 types and had a discrimination index of 0.961 (95% confidence interval = 0.886-1.00). PFGE and ERIC-PCR showed a 90.4% correlation in the designation of isolates as clonal or non-clonal in pairwise comparisons. Both systems were highly reproducible and provided highly similar and supplementary data compared with serotyping regarding the transmission dynamics of shigellosis in this community. ERIC-PCR is considerably more rapid and inexpensive than PFGE and may have a complementary role to PFGE for initial investigations of hypothesized outbreaks in resource-limited settings.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, N.I.H., Extramural

MeSH terms

  • Bacterial Typing Techniques / methods*
  • DNA, Bacterial / genetics
  • DNA, Bacterial / isolation & purification
  • DNA, Intergenic / metabolism
  • Diarrhea / epidemiology
  • Diarrhea / microbiology
  • Dysentery, Bacillary / epidemiology
  • Dysentery, Bacillary / microbiology
  • Electrophoresis, Gel, Pulsed-Field / methods
  • Humans
  • Polymerase Chain Reaction / methods*
  • Prevalence
  • Repetitive Sequences, Nucleic Acid*
  • Serotyping
  • Shigella / classification
  • Shigella / genetics
  • Shigella / isolation & purification*

Substances

  • DNA, Bacterial
  • DNA, Intergenic