pink to mauve
colourless, blue or inhibited
CHROMagar™ Staph aureus is a selective chromogenic culture medium intended for use in the qualitative direct detection, differentiation and presumptive identification of Staphylococcus aureus to aid in the diagnosis of S. aureus colonization. The test is performed with swabs from teguments, wounds or soft tissue specimens. Results can be interpreted after 18-24 h of aerobic incubation at 35-37 °C.
The medium can also be used as an early warning indicator for diagnostic tests of infections to signal the possible presence of S. aureus. This use does not replace the institution’s protocols.
Concomitant cultures are necessary to recover organisms for further microbiological testing or epidemiological typing. A lack of growth or the absence of colonies on CHROMagar™ Staph aureus does not preclude the presence of S. aureus. CHROMagar™ Staph aureus is not intended to diagnose infection nor to guide nor monitor treatment for infections.
CHROMagar™ Staph aureus can also be used in the detection of S. aureus in the analyses of food products for human consumption, animal feed and in environmental samples.
Food & environmental quality control:
Human beings are the main reservoir of S. aureus. A carrier contaminates the surrounding environment when coughing, sneezing and by touching food with a hand. It is often found in the environment and on food preparation surfaces and also in certain uncooked foods (dairy products, salads, sandwiches...). It is important to check the presence of S. aureus before and after the foodstuff sterilisation process.
1. Easy to prepare: The conventional medium for S. aureus is the Baird-Parker which has to be supplemented with RPF (Rabbit Plasma Fibrinogen), rendering the plate manufacturing delicate and complex, and also reducing the shelf life of the poured plates to a couple of weeks.
On the contrary, CHROMagar™ Staph aureus comes with all the compounds already in the agar (no need of any supplement) and remains stable.
Clinical application :
S. aureus is the leading cause of skin and soft tissue infections and can also cause serious infections such as bloodstream infections, pneumonia, or bone and joint infections.
1. Easy to read compared to Blood agar or Mannitol Salt Agar. CHROMagar™ Staph aureus allows easier differentiation of S. aureus colonies enhanced by a mauve colour and is of considerable help in identifying suspect colonies. thus, it reduces the confirmatory workload.