We report an outbreak of equine piroplasmosis in southern Texas, USA, in 2009. Infection prevalence reached 100% in some areas (292 infected horses). Amblyomma cajennense was the predominant tick and experimentally transmitted Theileria equi to an uninfected horse. We suggest that transmission by this tick species played a role in this outbreak.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3310643PMC
http://dx.doi.org/10.3201/eid1710.101182DOI Listing

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