Abstract
Impedance detection times were compared with traditional plating methods for enumerating antibiotic-resistant strains of Salmonella stanley, Salm. thompson and Salm. infantis grown in laboratory medium and pork slurry. The correleation of log10 counts of salmonellas with detection times was highly significant (r= -0·96 for broth and r= -0·94 for slurries. The confidence limits (± og10 1·0 for broth and ± log10 1·65 for slurry) indicated that detection times could reliably be used as a rapid means of enumerating salmonellas when large numbers of counts of known strains are required for growth studies. Use of antibiotic-resistant strains also permitted their selective detection by impedance from the natural spoilage flora of pork slurry when the same antibiotics were incorporated in the detection medium.
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