Okla. Admin. Code § 35:15-18-2
The following words and phrases shall have the following meanings:
"Equine Piroplasmosis reactor" means any Equidae that tests positive for Equine Piroplasmosis from either B. caballi or T. equi but has not been confirmed by NVSL.
"Exposed" means all Equidae in the same herd as a Piroplasmosis positive animal or had recent direct and sustained contact with a Piroplasmosis animal.
"High risk premises" means premises where transmission of Equine Piroplasmosis is known or suspected to have occurred or has the potential to occur, through either natural tick borne transmission or high risk management practices and as determined by the State Veterinarian.
"Low risk premises" means premises where transmission of Equine Piroplasmosis has not been demonstrated or suspected to have occurred and has a low potential to occur, through either natural tick borne transmission or management practices and as determine by the State Veterinarian.
"Negative Equidae" means Equidae that show a negative result to a competitive enzyme-linked immunosorbent assay (c-ELISA) test for Equine Piroplasmosis or have been classified negative by the designated epidemiologist, based on history, supplemental tests, or other epidemiological evidence.
"Positive Equidae" means Equidae that show a positive result to for Equine Piroplasmosis by the National Veterinary Services Laboratories (NVSL) on the complement fixation (CF) test or competitive enzyme-linked immunosorbent assay (c-ELISA) test.
"Racetrack facility" means a premises used to conduct live horse racing events and is not limited to facilities licensed by the Oklahoma Horse Racing Commission.
"Suspect case" means an Equidae with clinical signs consistent with Equine Piroplasmosis, a history of exposure, or a non-negative test.
Okla. Admin. Code § 35:15-18-2