抄録
Six 5-week-old porcine circovirus type 2 (PCV2)-free cesarean-derived, colostrums-deprived (CDCD) pigs were inoculated intranasally with 106 TCID50 of PCV2. Four CDCD pigs were untreated cohabitants. Forty farm-raised pigs from two PCV2-contaminated herds were randomly selected for PCV2 trace investigations. Blood, nasal, oropharyngeal, and fecal samples were collected from all tested pigs weekly. The PCV2 DNA shed at 6–11 and 7–12 weeks old for PCV2-inoculated pigs and cohabitants, respectively. All the CDCD pigs seroconversion after PCV2 exposure. PCV2 shed at 9–15 weeks old and seroconversion start at 11 weeks old in farm-raised pigs. Collectively, pigs had a prolonged PCV2 shedding period following viral exposure, and growing pigs were the source of horizontal PCV2 transmission in PCV2-infected herds.
