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To produce safe and high quality processed milk, high pressure (HP) technology was tested to inactivate undesired microorganisms and their caseinolytic activity. A Pseudomonas fragi strain, isolated from the inner surface of a cheese-making machine from a dairy plant, was shown to harbour the aprX gene and cause casein proteolysis. Single-cycle HP processing of P. fragi-spiked milk at 450 MPa and...