Antigen-specific T lymphocyte proliferation to Salmonella Gallinarum. Antigen-specific proliferation of lymphocytes from peripheral blood in chickens, orally prime-boost immunized with the vaccine candidate strain (JOL916) and/or the LTB adjuvant strain (JOL1229) using soluble antigen from the wild-type SG. Groups A to C are referred to in Figure 1. Asterisks indicate a significant difference between each immunized and control group (p < 0.05). wppi = week post-prime-immunization; wpbi = week post-boost-immunization.