Fig. 3

REV-specific antibody levels assessed weekly post-immunization in breeder hens vaccinated with gp90 recombinant protein vaccine and CpG-ODN adjuvant. w.p.i. indicates weeks post immunization; line with the red arrow indicates the positive critical value as determined using an IDEXX ELISA test kit, where serum samples with a titer higher than 1076 were considered as REV-antibody positive