Use of a multinomial logistic regression model to evaluate risk factors for porcine circovirus type 2 infection on pig farms in the Republic of Korea

The current study identified risk factors associated with porcine circovirus type 2 (PCV2) infection on pig farms in the Republic of Korea using a multinomial logistic regression model to evaluate the PCV2 infection status of pigs at different growth stages. Compulsory disinfection of visitors (odds ratio [OR]: 0.019, 95% confidence interval [CI]: <0.001&#8211;0.378, p=0.0095), compulsory registration of visitors (OR: 0.002, 95% CI: <0.001&#8211;0.184, p=0.0070), regular blood testing (OR: 0.012, 95% CI: <0.001&#8211;0.157, p=0.0007), and running on-farm biosecurity learning programs for workers (OR: 0.156, 95% CI: 0.040 &#8211;0.604, p=0.0072 and OR: 0.201, 95% CI: 0.055&#8211;0.737, p=0.0155, respectively) were identified as factors which could reduce the risk of PCV2 infection. However, visitation by a regular veterinarian (OR: 32.733, 95% CI: 3.768&#8211;284.327, p=0.0016) was associated with PCV2 infection.