Testing cattle with Johnin: Being a report on the value of the intradermal test on cattle

Abstract

In the last century a wasting disease of cattle in which diarrhoea was the prominent symptom was described by some veterinarians, but was at first often confused with tuberculosis although the distinctive lesions found in the latter disease were not present at post-mortem examination. However, it is only during the last forty years that Johne's disease has been clearly differentiated from bovine tuberculosis.