Existence of Premunition in Natural or Experimental Rickettsiosis of the Dog

In the meeting of 12 June 1935 of the Societe de Pathologie Exotique, the existence in Algeria of a pathogenic Rickettsia of the dog, was noted and the name Rickettsia canis proposed. This parasite is very frequent in Algeria, and is transmitted naturally by the tick Rhipiciphalus sanguineus, which is infectious at every stage, and among which the virus is hereditary. This tick is, in Algeria, very frequent from April to October. It is called the dog tick because it has a marked predilection for this species. Observations and experiments, show that 1 R. canis remains in the organism a long while 5 months or less after the clinical cure of an acute attack natural or experimental and 2 Animals cured of an acute attack endure a reinoculation without presenting any morbid symptoms.