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A cefoperazone-sulbactam Etest (2:1) is listed on the AB Biodisk International catalog. This means that the Etest is not FDA-approved for diagnostic testing and the strips should not be used in the United States for this purpose. In my experience, non-FDA approved strips can be purchased from AB Biodisk if a letter is provided stating that the purchaser is aware these Etests are for investigational use only. You should contact the company regarding the details of purchase.
The drug ratio on the Etest strip is cefoperaxone 2: sulbactam 1, not the 1:1 ratio mentioned in the question. In 1987 Ronald N. Jones et al. published a manuscript recommending a 2:1 ratio for susceptibility testing (J Clin Microbiol. 1987. 25(9): 1725-1729). The 2:1 ratio was recommended because it mimics drug formulations and demonstrated better activity than fixed concentrations of sulbactam.
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