The trypanosomes causing dourine ( Mal de Coït or Beschälseuche

Abstract

About the middle of the year 1910, whilst examining our laboratory strain of Trypanosoma equiperdum , short parasites, certain of which exhibited a posterior displacement of the nucleus, were observed. This strain had been preserved at the Runcorn Laboratory by passage through experimental animals since 1907, when it was obtained from the Kaiserliches Gesund-heitsamt, Berlin. As these posterior nuclear forms had not been described in T. equiperdum we asked Prof. Schilling for further animals infected with this strain which had been preserved by him. Examination of the parasites in these animals likewise revealed the presence of the posterior nuclear forms. Having satisfied ourselves that these forms are a constant feature of the strain, we published a short preliminary note drawing attention to this fact.