The following words and terms, when used in this chapter, shall have the defined meanings, unless the context clearly indicates otherwise:(1) Bovine Viral Diarrhea (BVD) - Bovine viral diarrhea is a viral disease of cattle that is caused by the bovine viral diarrhea virus (BVDV).(2) BVDV Persistently Infected (BVDV-PI) Cattle--Any cattle with positive results on a BVDV antigen detection test (e.g., ELISA [enzyme-linked immunosorbent assay], PCR [polymerase chain reaction], or BVDV immunohistochemistry [IHC]) that either are not retested, or that have a positive result on a BVDV retest.(3) BVDV Retest--A subsequent test for BVDV using an antigen detection test (e.g., ELISA [enzyme-linked immunosorbent assay], PCR [polymerase chain reaction], or BVDV immunohistochemistry [IHC]).(4) Cattle--All dairy and beef animals (genus Bos).(5) Commission--The Texas Animal Health Commission.