Assertion: purpura | /r/HasProperty | treated at referral center
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Source sentences:
text: Of 53 horses with purpura hemorrhagic treated at a referral center, 17 had been exposed to or infected with S. equi, 5 had been vaccinated with S. equi M protein, 9 had been infected with C. pseudotuberculosis, and 5 had a history of apparently infectious respiratory disease of undiagnosed cause.