Listeria monocytogenes and enterotoxigenic Staphylococcus aureus in dry fermented sausages belonging to “Traditional Agri-Food Product” produced in Southern Italy

The aim of this study was to assess the microbiological quality and safety of typical dry fermented sausages produced in Apulia region, Southern Italy, classified as “Traditional Agri-Food Products” (T.A.P.). A total of 106 samples were collected and analyzed. Two samples of Soppressata di maiale nero dei Monti Dauni (1.89%) were positive to Listeria monocytogenes. Nevertheless, the loads were <100 cfu/g hence all samples had a satisfactory microbiological quality. According to Gilbert's guidelines, 9.43% of the analyzed samples showed unsatisfactory microbiological quality since Staphylococcus aureus was between 100 and <104 cfu/g. Moreover, 7.54% of the dry fermented sausages analyzed had unacceptable microbiological quality since S. aureus loads were >104 cfu/g. Five isolated strains of S. aureus were enterotoxigenic. Based on findings, it is essential to apply and maintain good hygiene practices throughout the food chain, especially for T.A.P., which are often produced in small family processing plants using production protocols based on the experience handed down from father to son.