(a) EVA classification for reporting purposes:
  (1) Carrier Stallion. A stallion that has been determined through virus isolation, positive PCR tests on semen, breeding to naive mares or any combination of procedures to shed EVA virus in semen.
  (2) EVA caused abortion. An abortion in mares which has been determined to have been caused by EVA virus through a combination of clinical symptoms and laboratory procedures, including virus isolation or positive PCR tests on fetal tissues or placenta.
  (3) EVA respiratory disease. A respiratory disease determined to have been caused by EVA virus through a combination of clinical history, clinical symptoms and laboratory results, including positive PCR test results on naso-pharyngeal or conjunctival swabs, or whole blood; virus isolation; or four-fold increase in serological titers on blood samples collected 14 to 21 days apart.
(b) The owners, managers or caretakers of Equine Viral Arteritis (EVA) carrier stallions shall provide written notification, to owners of mares that are to be bred to the EVA carrier stallion, either by live cover or artificial insemination, that the stallion is a EVA carrier and that the mare could become infected with EVA through breeding to the carrier stallion.
(c) The Executive Director may restrict movement of equine epidemiologically deemed to be a high risk for the spread of EVA.

Source Note: The provisions of this §49.4 adopted to be effective October 14, 2007, 32 TexReg 7042