Rickettsia-like Organism from Normal Dermacentor andersoni Stiles

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Abstract
Rickettsia dermacentrophila, occurring spontaneously in the tissues of D. andersoni, is described. It cannot be cultivated on various artificial media, but is readily maintained by serial passage in incubating fertile chick eggs. The egg fluids, which constantly contain large numbers of organisms, were used as the transfer medium. It is nonpathogenic for laboratory animals and various rodent hosts of D. andersoni, and inoculated animals are not rendered immune to Rocky Mt. spotted fever or American "Q" fever.

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