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The occurence of Listeria species in refrigerated chicken carcasses was evaluated, comparing the conventional culture methodology of FDA, modified by the introduction of a secondary enrichment step prior plating, and the ClearviewTM rapid method (Oxoid, UK Ltd). Forty-eight refrigerated whole chicken carcasses purchased from supermarkets in Florianópolis, SC, Brazil, were analysed. Listeria species occured in 21 (43.7%) samples. Using the Clearview method, 17 (35.4%) samples were positive for Listeria species. Of these isolates, 11 (23%) were L. monocytogenes, 4 (8.3%) L. innocua, 1 (2.1%) L. welshimeri and 1 (2.1%) L. seeligeri. Using the conventional culture methodology of FDA (with modifications), 14 (29.2%) samples were positive for Listeria species. Among these 7 (14.6%) were L. monocytogenes, 6 (12.5%) L. innocua and 1 (2.1%) L. seeligeri. With the Clearview rapid method plus API Listeria for identification, results were confirmed to Listeria species level within 115-139 h. Using the conventional culture method of FDA (with modifications) plus API Listeria, results were confirmed within 120-160 h. However, the Clearview method could indicate the presence of Listeria organisms in only 43 h. Results given by the methods were in moderate concordance and the differences between them were not significant (C.I. = 95%). Avaliou-se a ocorrência de Listeria spp em carcaças refrigeradas de frango, comparando-se a metodologia convencional recomendada pelo FDA, modificada pela introdução de uma segunda etapa de enriquecimento antes do plaqueamento, e o método rápido ClearviewTM (Oxoid, UK, Ltd). Foram analisadas 48 carcaças de frango de diferentes marcas e supermercados de Florianópolis, Brasil. Listeria spp foi encontrada em 21 (43,7%) amostras. Através do método Clearview encontrou-se 17 (35,4%) amostras positivas para Listeria spp, das quais 11 (23%) eram L. monocytogenes, 4 (8.3%) L. innocua, 1 (2.1%) L. welshimeri e 1 (2.1%) L. seeligeri. Através do método convencional modificado obteve-se um total de 14 (29.2%) amostras positivas para Listeria spp, das quais 7 (14.6%) eram L. monocytogenes, 6 (12.5%) L. innocua e 1 (2.1%) L. seeligeri. Com o método Clearview + API Listeria, obteve-se resultados confirmados à nível de espécie em 115-139 h, e com o método convencional modificado + API Listeria os resultados foram obtidos em 120-160 h. No entanto, o método Clearview pode indicar a presença de Listeria spp em apenas 43 h. Os resultados obtidos pelos métodos utilizados mostraram-se moderadamente concordantes e não apresentaram diferença significativa num intervalo de confiança de 95%

Detection of Listeria species in refrigerated chicken carcasses using Clearview tm and a modified conventional culture method