Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

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)

Main Article

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.

Main Article

Top of Page

USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO