Use of the Petrifilm Test Kit-HEC Direct Blot Enzyme Immunoassay Method without Swab Pre-Enrichment to Screen for Low Levels of Escherichia coli O157 : H7 on Beef Carcasses by Surface Swabbing.

A total of 750 beef carcasses were assayed to detect E. coli O157:H7 by surface swabbing. Each swab represented a 200-cm composite surface area.

Direct Enumeration of Escherichia coli O157:H7 from Petrifilm EC Count Plates Using the Petrifilm Test Kit - HEC Without Sample Pre-Enrichment.

Enumeration of Escherichia coli O157:H7 from Petrifilm E. coli (PEC) Count plates was studied incorporating the Petrifilm -HEC kit without sample pre-enrichment. Samples containing various E.

Selective Enumeration of Bifidobacterium bifidum , Enterococcus faecium , and Streptomycin-Resistant Lactobacillus acidophilus from a Mixed Probiotic Product.

Modified VF-Bouillon agar with 0.5 mg/ml lithium chloride, 20 μg/ml sodium lauryl sulfate, 5 mg/ml sodium propionate, and 10 μg/ml neomycin sulfate was used with a triple-layer diffusion technique to selectively enumerate Bifidobacterium bifidum . Modified Brigg's agar was used to enumerate Enterococcus faecium .