Fig. 2.The intestinal secretory IgA (sIgA) antibody response was measured in chickens against the outer membrane protein for 7 weeks PPI. Antibody levels were expressed as mean±standard deviation values for each week post-immunization. Statistical significance was defined at p-values ≤0.05 or 0.01. Arrow indicates that the booster was performed at fourth week PPI. PPI, post-prime immunization; group A, non-immunized control; group B, orally primed and boosted; group C, primed orally and boosted intramuscularly; group D, primed and boosted intramuscularly; group E, primed intramuscularly and boosted orally. *p < 0.05 vs. unvaccinated control. Fig. 2.The intestinal secretory IgA (sIgA) antibody response was measured in chickens against the outer membrane protein for 7 weeks PPI. Antibody levels were expressed as mean±standard deviation values for each week post-immunization. Statistical significance was defined at p-values ≤0.05 or 0.01. Arrow indicates that the booster was performed at fourth week PPI. PPI. . . Clin Exp Vaccine Res. 2016 Jul;5(2):148-158. http://dx.doi.org/10.7774/cevr.2016.5.2.148