The PRRS virus, or Porcine Reproductive and Respiratory Syndrome virus, is a significant pathogen affecting pigs. It primarily causes reproductive issues in breeding sows, leading to problems such as stillbirths and weak piglets. Additionally, it can cause respiratory illness in pigs of all ages, resulting in increased mortality and reduced growth rates. This virus is highly contagious and can spread through direct contact between animals or indirectly via contaminated equipment, clothing, or vehicles. Vaccination and biosecurity measures are essential for managing and preventing outbreaks of PRRS virus on farms, helping to protect pig health and productivity.