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 1 Number of positive test portions out of 20 test portions generated with different neutralizing broths when the initial inoculation level was ~ 25 CFU/square and no Whisper™ V was applied to Lm cells before sampling. Neutralizing broths were stored at 4 °C before use for the sample collection

Sample storage condition between collection and analysis	Number of positive test portions out of 20 test portions collected using each neutralizing broth
Sample storage condition between collection and analysis	D/E	Letheen	HiCap
2 h at RT (p = 0.51)^a	11	8	7
72 h at 4 °C (p = 0.48)	5	9	6

^aExtended Fisher’s exact test was performed for each row among different enrichment broths

ISSN: 1471-2180