Description
Coagulase positive staphylococci. Enumeration in foods. Coagulase positive staphylococci (CPS) are enumerated by surface inoculation of decimal dilutions of a specified quantity of the food sample on the selective agar-medium Baird- Parker (BP) and/or Baird-Parker agar with a Rabbit-plasma fibrinogen supplement (BP+RPF). After incubation, typical and atypical colonies are counted. By the use of BP, a selection of colonies must be confirmed by the coagulase test.