Lydia Rabinowitsch and Walter Kempner's1 study of the flagellate parasite of the rats' blood, the trypanosoma, establishes another example of hematozoon infection, like malaria and Texas fever, in which the infection is carried by suctorial insects, in this case by the flea especially. These insects draw the blood of the infected rats; the trypanosoma has the power of remaining alive for a time in the body of the insect, whence it is again deposited into a healthy rat during the act of sucking blood. The full cycle of development of the parasite has not been wholly traced, but based on analogy with malarial and similar infections we undoubtedly have here an instructive example of a hematozoon which requires two hosts for its existence, the rat and an insect like the flea. The complete demonstration of this double existence of animal parasites of the blood, through the work of such
HEMATOZOON INFECTION IN RATS. JAMA. 1900;XXXIV(17):1076. doi:https://doi.org/10.1001/jama.1900.02460170056015
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