The ability to identify quickly and accurately has become increasingly important in clinical microbiology. Susceptibility to desferrioxamine, an iron-chelating agent, was investigated as a new test for the identification of . All strains of and tested were susceptible to a 1000-μg disk of desferrioxamine when grown on brain heart infusion agar. All other strains of coagulase-negative staphylococci, and micrococci were resistant. As a single test, susceptibility to desferrioxamine was 96.4% efficient in identifying ; when combined with additional tests such as alkaline phosphatase production and fermentation of trehalose, the efficiency improved to 100%. Desferrioxamine disks were easy to prepare, stable and inexpensive. The test was simple to perform and interpret and should readily find application in clinical microbiology laboratories.


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