Evaluation of the dry sheet medium (Compact Dry LS) for screening of total Listeria count in food samples

The Compact Dry LS (CD-LS), ready-to-use dry sheet selective medium for Listeria species, was evaluated for inclusivity and exclusivity by using 107 strains including 20 Listeria species strains. All tested Listeria species strains other than Listeria seeligeri that grew as blue colored colony on CD-LS. CD-LS were compared with those on Oxford agar and ALOA agar as conventional methods using Listeria species inoculated from 100 food samples. The correlation coefficients between CD-LS and Oxford agar, and CD-LS and ALOA agar were 0.983 and 0.978, respectively. Our results suggested CDLS was a suitable alternative medium for screening of Listeria species.