Hi Diane, I spoke with an ID doctor at the BVAMC. He has a great deal of experience in treating mycobacterial infections in animals. He recommended Azithromycin- 10 mg/kg/day AND Ethambutol- 15mg/kg/day. Both are given orally. He would like to speak with you before starting any treatment. He has questions on the ferret's clinical symptoms and biopsy. Please e-mail me <[log in to unmask]> and I will give you his office number. Hugs and kisses to Rhett! Jill Northrup [Posted in FML issue 1951]