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Volume 17, Number 10—October 2011


Equine Piroplasmosis Associated with Amblyomma cajennense Ticks, Texas, USA

Glen A. ScolesComments to Author , H. Joel Hutcheson, Jack L. Schlater, Steven G. Hennager, Angela M. Pelzel, and Don P. Knowles
Author affiliations: US Department of Agriculture and Washington State University, Pullman, Washington, USA (G.A. Scoles, D.P. Knowles); US Department of Agriculture, Ames, Iowa, USA (H.J. Hutcheson, J.L. Schlater, S.G. Hennager); US Department of Agriculture, Fort Collins, Colorado, USA (A.M. Pelzel)

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Table 2

Tick species found on horses at index ranch of equine piroplasmosis outbreak in southern Texas, USA, 2009

Species No. (%) horses* No. ticks
Average no. ticks/horse
Male Female Nymph
Amblyomma cajennense 180 (78.9) 201 229 1 2.4
A. maculatum 45 (19.7) 43 33 0 1.7
Dermacentor (Anocentor) nitens 7 (3.0) 4 7 3 2
D. variabilis 37 (16.2) 20 34 0 1.6

*Of 228 horses sampled, 41 had >1 species of tick present.

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