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Volume 17, Number 10—October 2011

Dispatch

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 1

Horses tested by competitive ELISA for Theileria equi on index ranch of equine piroplasmosis outbreak in southern Texas, USA, 2009

Ranch division No. positive/no. tested (%)
A* 213/281 (75.8)
B 36/36 (100)
C 10/10 (100)
D
33/33 (100)
Total 292/360 (81.1)

*Division A contained all younger stock. Infection rates among younger animals were lower. The other 3 divisions contained mostly horses used for working cattle.

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