Mutilation of the external ear and adjacent tissues was an enzootic problem in outbred Mcr:(ICR) breeder mice in a commercial colony. Necropsy examination of affected and randomly selected, nonaffected adult breeder mice revealed a probable association of the cutaneous lesions with suppurative otitis media. Several microorganisms, including Mycoplasma pulmonis and Pasteurella pneumotropica, were isolated from the tympanic bullae.
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