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. 2011 Oct;17(10):1903–1905. doi: 10.3201/eid1710.101182

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.