False positive fecal coliform in biosolid samples assayed using a-1 medium

Katherine H. Baker, Brady Redmond, Diane S. Herson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Two most probable number (MPN) methods-lauryl tryptose broth with Escherichia coli broth confirmation and direct A-1 broth incubation (A-1)-were compared for the enumeration of fecal coliform in lime-treated biosolid. Fecal coliform numbers were significantly higher using the A-1 method. Analysis of positive A-1 tubes, however, indicated that a high percentage of these were false positives. Therefore, the use of A-1 broth for 40 CFR Part 503 Pathogen Reduction (CFR, 1993) compliance testing is not recommended.

Original languageEnglish (US)
Pages (from-to)423-424
Number of pages2
JournalWater Environment Research
Issue number4
StatePublished - 2005

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


Dive into the research topics of 'False positive fecal coliform in biosolid samples assayed using a-1 medium'. Together they form a unique fingerprint.

Cite this