The isolation of Listeria spp. from brewer's grainswas performed according to the double enrichment method (non-selective enrichment and selective enrichment) followed by plate isolation procedures described in the Bacteriological Analytical Manual of the USA-FDA (Hitchins, 1998), with modifications in the media and selective agents used. Twenty five grams of each sample were homogenized in 225 mL of tryptic soy broth (TSB) and incubated at 37 C for 24 h (nonselective enrichment). Aliquots of 1 mL of primary enrichment were transferred to 10 mL of TSB supplemented with tripaflavine and ceftazidime and incubated at 4 C for 24 h and then at 37 C for 24 h (selective enrichment). Subsequently, aliquots of 0.1 mL of secondary enrichments were plated in duplicate in Palcam agar (Merck®, Germany) supplemented with selective agents. Typical colonies selected by Gram staining were subcultured in tryptic soy agar (TSA) for further biochemical characterization.