The Experimental Transmission of Anaplasmosis by Dermacentor variabilis

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Abstract
Ticks engorging as larvae on cases of anaplasmosis transmitted it as nymphs to 2 susceptible bulls. Ticks engorging as nymphs on a convalescing case transmitted it to 2 susceptible bulls. The test of "hereditary" transmission was negative when ticks engorged as adults on a case and the larvae of the next generation engorged on 2 susceptible bulls. The wide-spread occurrence of D. variabilis in the U.S.A. indicates the danger that anaplasmosis may spread into new areas thus far considered outside the enzootic range.

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