PCV2, or Porcine Circovirus Type 2, is a virus that primarily affects pigs. It is a small, circular virus that can lead to various health issues in swine, including respiratory problems and reproductive failures. The virus is often associated with a condition known as Postweaning Multisystemic Wasting Syndrome (PMWS), which can cause significant economic losses in the pig farming industry. Infection with PCV2 is widespread in pig populations worldwide, but not all infected pigs show symptoms. Vaccination has become a common preventive measure to control the spread of the virus and reduce its impact on pig health. Understanding PCV2 is crucial for maintaining the health of swine and ensuring the productivity of pig farming operations.