2.5. Enumeration of L. monocytogenes
Sample bags were opened and samples taken aseptically at three different
places resulting in a 25 g composite sample were placed into a
stomacher bag (Filtra-bag, VWR Canlab, AB, Canada) and homogenized
in 225 ml of 0.1% peptone water by stomaching for 2 min at medium
setting (Seward Stomacher, Fisher Scientific, ON, Canada).