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 show no symptoms, making it challenging to control outbreaks. Vaccination and biosecurity measures are essential for managing BVDV and protecting the health of cattle herds.