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Updated: Jan 26, 2026

Listeria monocytogenes Infection of the Brain
Published on: October 2, 2018
Comparison of Procedures for Isolating Listeria monocytogenes in Soft, Surface-Ripened Cheese
Michael P Doyle1, Jean L Schoeni1
1Food Research Institute, University of Wisconsin, Madison, Wisconsin 53706.
Abstract:
Ninety samples of soft, surface-ripened cheese from a lot previously identified to contain Listeria were assayed for Listeria monocytogenes by three procedures. These included: (a) cold enrichment, (b) the Food and Drug Administration enrichment procedure, and (c) the selective enrichment procedure of Doyle and Schoeni (Appl. Environ. Microbiol. 15:1127, 1986). L. monocytogenes was isolated from 41 of the 90 cheese samples. The organism was isolated from only 9 of the 41 L. monocytogenes -positive samples by more than one procedure. Most isolations (21) were made by the cold enrichment procedure, with 16 and 13 isolations made by the FDA and Doyle-Schoeni procedures, respectively. In most instances, the organism was isolated from a cheese sample by only one procedure.
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