Bacterial Proteins/metabolism; Chaperonins/metabolism; DNA Primers/chemistry; Gene Expression; Staphylococcus/classification; Staphylococcus/isolation & purification; Animals; Bacteremia/blood; Bacteremia/diagnosis; Bacteremia/microbiology; Bacteremia/urine; Bacterial Proteins/genetics; Chaperonin 10/genetics; Chaperonin 10/metabolism; Chaperonin 60/genetics; Chaperonin 60/metabolism; Chaperonins/genetics; DNA, Bacterial/blood; DNA, Bacterial/metabolism; DNA, Bacterial/urine; DNA, Intergenic/blood; DNA, Intergenic/metabolism; DNA, Intergenic/urine; Food Inspection/methods; Food Microbiology; Humans; Milk/microbiology; Molecular Typing; Oligonucleotide Array Sequence Analysis; Polymerase Chain Reaction; Serotyping/methods; Staphylococcal Food Poisoning/blood; Staphylococcal Food Poisoning/diagnosis; Staphylococcal Food Poisoning/microbiology; Staphylococcal Food Poisoning/urine; Staphylococcal Infections/blood; Staphylococcal Infections/diagnosis; Staphylococcal Infections/microbiology; Staphylococcal Infections/urine; Staphylococcus/genetics; Staphylococcus/metabolism