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

Table 5 Number of positive test portions out of 20 test portions generated with HiCap broth stored at RT, HiCap broth and D/E broth stored at 4 °C before sample collection when the initial inoculation level was ~ 3000 CFU/square and 8000 ppm of Whisper™ V was applied to Lm cells before sampling

Storage condition between sample collection and analysis	Number of positive test portions collected using neutralizing broths stored under different conditions before use^a
Storage condition between sample collection and analysis	HiCap at RT	HiCap at 4 °C	D/E at 4 °C
2 h at RT (p = 0.94)^a	11	12	13
72 h at 4 °C (p = 0.71)	14	13	11

ISSN: 1471-2180