There are at least three genetically distinct small piroplasms from dogs

A. M. Kjemtrup, A. A. Kocan, L. Whitworth, J. Meinkoth, A. J. Birkenheuer, J. Cummings, M. K. Boudreaux, S. L. Stockham, A. Irizarry-Rovira, Patricia A Conrad

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


The 18S nuclear subunit ribosomal RNA (18S rRNA) gene of small piroplasms isolated from dogs from Okinawa (Japan), Oklahoma, North Carolina, Indiana, Missouri, and Alabama, was isolated and sequenced. Phylogenetic analysis of these sequences and comparisons with sequences from other Babesia, Cytauxzoon, and Theileria species revealed that all canine small babesial isolates, with the exception of isolates from California and Spain, were placed in a group containing the Babesia spp. sensu stricto. Within the Babesia spp. sensu stricto, there was support for separating the small canine piroplasms from the large canine piroplasm, Babesia canis. The isolate from California was in a distinct phylogenetic clade, closely related to babesial isolates from wildlife and humans from the Western US. The canine isolate from Spain was closely related to Babesia microti. These results suggest that there are multiple small piroplasm species in dogs. The isolates from the Midwestern and Eastern US and the one from Japan probably represent a single species with wide geographic distribution. Copyright (C) 2000 Australian Society for Parasitology Inc.

Original languageEnglish (US)
Pages (from-to)1501-1505
Number of pages5
JournalInternational Journal for Parasitology
Issue number14
StatePublished - 2000


  • 18S rRNA phylogeny
  • Anaemia
  • Babesia canis
  • Babesia gibsoni
  • Piroplasms
  • Protozoa
  • Tick vector
  • Tick-transmitted

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases


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