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1 July 2002 Transmission of Hepatozoon americanum (Apicomplexa: Adeleorina) by Ixodids (Acari: Ixodidae)
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Abstract

American canine hepatozoonosis (ACH) caused by Hepatozoon americanum Vincent-Johnson, Macintire, Lindsay, Lenz, Baneth, and Shkap is an emerging, often fatal, tick-borne protozoal disease of dogs in the United States of America. Dogs acquire infection by ingesting ticks that contain oocysts. To understand the invertebrate (definitive) host range of H. americanum, experiments were carried out using four ixodids, Rhipicephalus sanguineus (Latreille), Dermacentor variabilis Say, Amblyomma americanum (L.), and Amblyomma maculatum Koch. Laboratory-reared nymphal ticks were fed on dogs that were either naturally or experimentally infected with H. americanum; when these ticks molted to the adult stage they were either fed to susceptible dogs or were dissected and examined for the presence of oocysts. Mature H. americanum oocysts were found in >90% of A. maculatum (both males and females), whereas oocysts were not found in any of the other three species. These results confirm that A. maculatum is an excellent host and vector for H. americanum and also suggest that this apicomplexan may have a narrow invertebrate host range, at least among ixodid ticks that are likely candidate vectors in the United States.

S. A. Ewing, J. S. Mathew, and R. J. Panciera "Transmission of Hepatozoon americanum (Apicomplexa: Adeleorina) by Ixodids (Acari: Ixodidae)," Journal of Medical Entomology 39(4), 631-634, (1 July 2002). https://doi.org/10.1603/0022-2585-39.4.631
Received: 17 September 2001; Accepted: 1 February 2002; Published: 1 July 2002
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