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  • Title: Occurrence of Arcobacter spp. and correlation with the bacterial indicator of faecal contamination Escherichia coli in bivalve molluscs from the Central Adriatic, Italy.
    Author: Leoni F, Chierichetti S, Santarelli S, Talevi G, Masini L, Bartolini C, Rocchegiani E, Naceur Haouet M, Ottaviani D.
    Journal: Int J Food Microbiol; 2017 Mar 20; 245():6-12. PubMed ID: 28113092.
    Abstract:
    A total of 162 samples of bivalve molluscs (45 mussels and 117 clams) collected between December 2012 and 2014 from harvesting areas of the Central Adriatic were analysed by a culturing method for the presence of Arcobacter spp. Species identification was performed by PCR and sequencing analysis of a fragment of the rpoB gene. Overall, Arcobacter species were detected in 30% of samples, specifically 33% clams and 22% mussels. A. butzleri was the most common species (20% of the samples), followed by A. cryaerophilus (9%) and A. skirrowii (1%). A seasonal association of A. butzleri contamination was detected. A. butzleri was significantly more commonly recovered from samples collected during the winter-spring period (29%) than from those of the summer-autumn (8%). A. cryaerophilus was cultured from 6% to 11% of the samples collected in summer-autumn and winter-spring, respectively, but these differences were not statistically significant. A. skirrowii was recovered from a sample of mussels harvested in May 2014. To identify associations between the occurrence of Arcobacter spp. and E. coli levels, samples were divided into groups generating results with E. coli at >230MPN/100g and E. coli at ≤230MPN/100g, the latter corresponding to EU microbiological criteria allowed for live bivalve molluscs at retail level. A. butzleri was significantly more commonly detected in samples with higher E. coli levels (48%) than in those with lower levels of E. coli (10%), providing evidence for considering E. coli as an index organism for A. butzleri contamination in bivalve molluscs.
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