MRSA Chromogenic Modified Agar Base is a chromogenic medium for the detection and differentiation of methicillin resistant Staphylococcus aureus and Staphylococcus epidermidis. Methicillin resistant Staphylococcus aureus, MRSA, are of particular interest at an international level due to its virulence and resistance to multiple antibiotics. The antimicrobial resistance is a serious threat to public health as it is now regarded as a major hospital acquired disease worldwide. The important changes observed in the epidemiological and microbiological characteristics of the infections caused by Staphylococcus aureus are the reason for the increment and prevalence of methicilin-resistant Staphylococcus aureus nosocomial (associated to hospitalized patients) and the proliferation of methicilin-resistant Staphylococcus aureus acquired by the community. The MRSA continues being a serious problem in many healthcare centres; more than 50% of the Staphylococcus aureus obtained are from Intensive Care Units (ICU) and close to 40% are from hospital patients. Effective, rapid laboratory diagnosis and susceptibility testing is critical in treating, managing and preventing MRSA infections. Methicillin resistant Staphylococcus aureus grow as magenta colonies. Methicillin resistant Staphylococcus epidermidis grow as green-blue colonies. The rest of the accompanying flora is inhibited. The cefoxitin inhibits the growth of Staphylococcus aureus sensitive to methicillin.
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