The enumeration of aerobic mesophiles was based on ISO4833:2003 (Anon., 2003a).
Standard coliforms counts were performed based on ISO 4832:1991 (Anon., 1991).
The detection and enumeration of coagulase-positive staphylococci (Staphylococcus aureus and other species) was performed based on ISO 6888-1:1999 (Anon., 1999).