Transboundary Emerging and Exotic Animal Disease/ Exotic Animal Disease Practice Exam

Which factor contributes to the spread of classical swine fever in pig populations?

1. Direct contact with infected animals

2. Airborne transmission

3. Water sources contaminated with virus

4. Inadequate vaccination

The correct answer is: Direct contact with infected animals

Direct contact with infected animals is indeed a significant factor contributing to the spread of classical swine fever (CSF) in pig populations. This disease is highly contagious among swine, and when healthy pigs come into close contact with infected individuals, the virus can easily be transmitted. The transmission can occur through various means, including physical touch, sharing of feed or water, and through contaminated equipment or clothing. In addition to direct contact, other factors like airborne transmission and contaminated water sources can play roles in spread; however, they are not as primary as direct contact. In areas where CSF is prevalent, the close living conditions of pigs often amplify the risk of transmission among herds. Inadequate vaccination can also be a contributing factor but primarily relates to the susceptibility of the population rather than the direct mode of spread. Thus, while several factors contribute to the disease's transmission, direct contact remains the most critical pathway in the spread of classical swine fever.