Isolate of Anaplasma marginale not transmitted by ticks.

R. D. Smith, M. G. Levy, M. S. Kuhlenschmidt, J. H. Adams, D. L. Rzechula, T. A. Hardt, K. M. Kocan

Research output: Contribution to journalArticlepeer-review


The tick-borne transmissibility of 2 isolates of Anaplasma marginale was compared. Dermacentor variabilis were exposed to A marginale as nymphs by feeding on 1 of 4 splenectomized calves during periods of ascending parasitemia (maximum 49% to 81% parasitized erythrocytes) induced by injection of a stabilate. Tick-borne transmission was attempted, using 26 to 224 adult ticks within 30 to 220 days after molting. Adult D variabilis did not transmit an Illinois isolate of A marginale in 7 tick-borne transmission experiments (P = 0.0047), including 2 experiments in which calves were inoculated IV with homogenates of adult ticks. In contrast, a Virginia isolate of A marginale was readily transmitted by the same tick colony. Thus, previously reported morphologic and immunologic differences among A marginale isolates may extend to tick-borne transmissibility. The Virginia and Illinois A marginale isolates had an inclusion appendage that was not a marker for tick transmissibility.

Original languageEnglish (US)
Pages (from-to)127-129
Number of pages3
JournalAmerican journal of veterinary research
Issue number1
StatePublished - Jan 1986
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)


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