Diagnosis of ear canker in dogs by bacterial-colony displacement.

The diagnosis of a case of ear canker in a dog by bacterial-colony displacement is described. In this case, the causative mite was detected on the primary plates inoculated from a bacterial swab. This result indicates that the phenomenon of bacterial-colony displacement should be noted and investigated in diagnostic laboratories, as it indicates the presence of a range of motile metazoan parasites which may prove to be of clinical significance.