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In a previous paper (Maddock, 1934), it has been shown that healthy calves may be infected with bovine tubercle bacilli when grazed upon pasture infected at intervals with emulsions of the virulent organisms. These infections were designedly heavy, and it was felt that this orientating experiment should be followed by one in which pasture infection was secured in a way more closely approximating to the natural.

epidemiology and infection

Experiments on the Infectivity for Healthy Calves of Bovine Tubercle Bacilli Discharged in Dung Upon Pasture Part I. From Tubercular Calves Fed with Emulsions of Tubercle Bacilli 1934–5. Part II. From Tubercular Cows Passing Tubercle Bacilli in their Dung 1935–6