Food. For the enumeration of CPS from food samples, accredited
methods according to standard microbiological procedures (ISO
6888-2:1999/Amend1: 2003) were used. S. aureus isolates were
identified using the ID 32 Staph System (bioMerieux, France) or GPVitek2
Cards (bioMerieux). All S. aureus isolates were stored
at 20 C in Microbank (Mast Diagnostic, Merseyside, UK) until
further analysis.