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Hello there this is Dr. Reupert I'm sorry to hear about the ear infection . They can be quite painful especially the bacterial types . Mupirocin is a good antibiotic for staph, as a rule and it can be formulated and compounded by Wedgwood Pharmacy . You will need a prescription from a veterinarian to obtain the solution. You did the medically correct thing by having it cultured.
I will attach a link to the pharmacy