Comparison of real-time, quantitative PCR with molecular beacons to nested PCR and culture methods for detection of Mycobacterium avium subsp. paratuberculosis in bovine fecal samples

J Clin Microbiol. 2002 Jan;40(1):287-91. doi: 10.1128/JCM.40.1.287-291.2002.


An automated PCR with fluorescent probes (molecular beacons) detected Mycobacterium avium subsp. paratuberculosis in bovine feces. When the PCR was compared with culture in testing 41 fecal samples, kappa scores of 0.94 to 0.96, a sensitivity of 93 to 96%, and a specificity of 92% were obtained. Results were quantitated by using a standard curve derived from a plasmid containing IS900. A minimum quantity of 1.7 x 10(-4) pg of DNA, correlating to 1 to 8 CFU, was detected.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Cattle
  • Cattle Diseases / diagnosis*
  • Cattle Diseases / microbiology
  • Culture Media
  • Feces / microbiology*
  • Molecular Probes
  • Mycobacterium avium subsp. paratuberculosis / genetics
  • Mycobacterium avium subsp. paratuberculosis / isolation & purification*
  • Paratuberculosis / diagnosis*
  • Paratuberculosis / microbiology
  • Polymerase Chain Reaction / methods*
  • Sensitivity and Specificity


  • Culture Media
  • Molecular Probes