[The reasons for the occurrence of non-specific reactions in the immunodiffusion test for enzootic bovine leukosis].

A batch of enzootic bovine leucosis antigen earmarked for immunodiffusion testing exhibited unspecific responses to cattle sera, which prompted an investigation of the underlying causes. Evidence was produced, for the first time ever, that such reactions were attributable to an antigen-antibody reaction caused by Mycoplasma arginini.