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July 18, 1908

Piroplasma Canis and Its Life Cycle in the Tick.

JAMA. 1908;LI(3):238. doi:10.1001/jama.1908.02540030060014

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This is an excellent piece of investigative work showing conclusively that piroplasmosis of the dog in India is transmitted by Rhipicephalus sanguinis (Latreille), whereas in South Africa it is transmitted by Hœmaphysalis lœchi (Audouin), as determined by Lounsbury. The infection is hereditary in the tick, the fact being noted that only the nymphs and adults from an infected female are infective, the larvæ not being able to produce the disease. The probable methods of evolution of the parasite in the blood are discussed, the author being of the opinion that a quotidian evolution occurs, in many cases. at least. The course of infection and the evolution of the parasite in the tick was also studied. In the gut it soon assumes the club-shaped form. This form infiltrates the body generally, including the salivary glands, and in the meantime has been changed into the spherical "zygotes," which commonly are intracellular. The

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