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Table 2 Number of positive test portions out of five test portions generated with D/E, Letheen and HiCap neutralizing broths when using an initial inoculation level of ~ 800 CFU/square and ~ 3000 CFU/square of Lm and different concentrations of Whisper V were applied to Lm cells before sampling. Neutralizing broths were stored at 4 °C before sample collection

From: Comparison of three neutralizing broths for environmental sampling of low levels of Listeria monocytogenes desiccated on stainless steel surfaces and exposed to quaternary ammonium compounds

Inoculation levels Neutralizing Broth Number of positive test portions at each quat concentration  
8000 ppm 4000 ppm 1600 ppm 800 ppm 400 ppm
~ 800 CFU/square Letheen 0 3 1 2 4
D/E 1 0 1 3 3
HiCap 1 1 1 3 4
~ 3000 CFU/square Letheen 0 4 4 5 5
D/E 5 3 2 4 5
HiCap 3 5 4 5 5