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Evaluation of a new chromogenic agar for the detection of Listeria in food

Aim:  Rapid identification of Listeria in food is important in protecting consumers from infection. The development of chromogenic media such as agar Listeria according to Ottaviani and Agosti (ALOA) has allowed more rapid detection of Listeria monocytogenes, with presumptive identification of this pathogenic species after only 24 h of incubation. The aim of this study was to evaluate Oxoid chromogenic Listeria agar (OCLA) in comparison with ALOA and a traditional, nonchromogenic medium, Oxford agar.