Transmission and inoculability of Spirillum Theileri (Laveran)

In 1903 Laveran described, under the name ofSpirillum Theileri , a micro-organism which I had found several times in sick cattle. In 1904 I described six cases. These cases, however, in my opinion did not represent a pure infection of Spirillum, since lesions were present in the red corpuscles, such as basophile granulations, indicating a previous infection withPiroplasma bigeminum . Therôle which the Spirillum itself plays as a cause of disease has not as yet been ascertained, but the following notes will help to throw some light on its pathogenic action.