Bovine Viral Diarrhea Virus (BVDV) is a contagious virus that primarily affects cattle. It can cause a range of health issues, including respiratory problems, reproductive failures, and gastrointestinal disorders. BVDV is classified into two main types: BVDV type 1 and BVDV type 2, each with different strains that can vary in severity. The virus spreads through direct contact with infected animals or contaminated environments. Infected cattle can shed the virus in their saliva, urine, and feces. Vaccination and biosecurity measures are essential for controlling the spread of BVDV and protecting the health of cattle herds.