Spirochaetosis of Mice due to Spirochaeta muris n.sp. in the Blood

Abstract

While studying the infection of Trypanosoma dimorphon in mice at the Pasteur Institute some five months ago, I noticed in one of the fresh blood preparations made from a brown mouse (A) infected with the trypanosomes, a small and very active spirochaete. At first I was of the opinion that its presence in the blood was due to contamination from the skin, but, as it was constantly present and was constantly present and was found in blood taken from any part of the body, it was evident that it was parasitic in the blood.