If A Laboratory Isolates S. Aureus From Five Patients On The Same Day Is It Necessary To Test The Antimicrobial Suceptibility Of Each Isolate?

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Yes its very important to check the antimicrobial susceptibilty of each isolate because of the increasing number of MRSA(methicillin resistant staph aureus)strains. Your management would differ with each patient,since penicillin is the drug of choice it can't always be used because it is also associated with hypersensitivity reactions so you also need to check for other alternative drugs,and for MRSA strains you would have to go for high grade antibiotics such as vancomycin.
Plus it also depends whether the bacteria was isolated from in patients(hospital acquired infection),most common source being doctors and nurses themselves.(Staph aureus is a part of  normal flora,so the staff are possible carriers of infection)
Therefore timely identification would prevent further infection  requiring  isolation of that  particular source(object/person).

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