Abstract
Extract Johne's disease of cattle has been an important cause of economic loss in Great Britain and Europe for many years (Doyle, 1956b Doyle, T. M. 1956a. Proc. O.E.E.C. Seminar on Johnc's Discase, Project No. 207 163–163. [Google Scholar] ), whilst recent reports tend to suggest that it is of no small importance in Australia (McQueen, 1959 McQueen, D. S. 1959. Aust. vet. J., 35: 47–47. [Google Scholar] ) and New Zealand (Chandler, 1957 Chandler, R. L. 1957. N.Z. vet. J., 5: 20–20. [Taylor & Francis Online] [Google Scholar] ).

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