The application of HPP treatment produced reductions in the counts of the three strains, being the magnitude dependent on each strain under study In each cycle, no significant differences among the 3 independent samples was observed for the three strains. Though, the efficiency of bacterial inactivation after the first treatment was almost the same
the HPP treatment time was different for the non-toxigenic strain and for the strain with one toxin (Fig. 1). After
30 min of treatment at 600 MPa, the RE of the non-toxigenic strainwas 4.5 log (out of 8.7 log) and, after 15 min at 600 MPa, the RE of the two toxigenic strains was 4.7 log and 5.5 log (out of 8.3 and 9.2
log, respectively), for the strain with one toxin and the strain with three toxins, respectively