Fig. 6
From: Newcastle disease virus-vectored West Nile fever vaccine is immunogenic in mammals and poultry
WNV IgG and NDV HI antibody titers of ducks. SPF ducks were intramuscularly or orally inoculated with two doses of rLa-WNV-PrM/E with a 3-week interval. Blood samples were collected 2 weeks after the first dose (prime) and second dose (boost) for antibody assays. Levels of the specific ELISA antibody (a) and vector (NDV)-specific HI antibody were determined (b). Duck serum was 1000× diluted for ELISA. Data are presented as mean ± SD for each group. (a), (b), (c), (d): p < 0.01, significance of the differences in antibody amounts between the first and second dose of immunization