Figure 8
Detection of anti-PCV2 titers by ELISA. 2-month-old SPF pigs were immunized at the base of the ear by the intramuscular route with CE, 4Cap(d41), and commercial vaccines, respectively. Serum samples were collected every week after the first immunization to determine the Cap-specific ELISA antibodies. In the eighth week after the first immunization, all vaccinated pigs were intranasally injected with 2 ml of PCV2 (105.7TCID50/mL). Data represent the mean ± SD. An asterisk (*) shows a statistically significant difference between the indicated groups (P < 0.05).