DNA extraction from milk, whey and cheese at 48 hBacterial genomic DNA was extracted using the silica columnmethod with the General Rapid Easy Extraction System (GREES)DNA kit (InCura S.r.l., Cremona, Italy), according to the manu-facturer’s instructions. Before DNA extraction, milk samples wereclarified as described by Rasolofo et al. [22], and 1 mL was used forboth the experiment and the NWC samples. Grated 48-h cheeseswere ground in a mortar and 450 mg were then used.