The initial bacterial counts in the samples are described in chapter
3.1. No Listeria spp. was detected in unspiked-unpressurized control
samples, not even after 41 days storage at 5.5 C (Figs. 2 and 3),
indicating a good quality and safety of the raw material used in this
experiment. Fig. 2 shows that L.innocua was reduced significantly
(p< 0.05) after 60 s at 500 MPa. One log reduction was observed and
the number decreased during storage.