FIG. 2.

Numbers and distribution of B and T lymphocytes in the livers of chickens following Salmonella serovar Typhimurium infection determined by immunohistochemistry. Sections were stained with monoclonal antibodies to chicken immunoglobulin (B cells) or CD3 (T cells). (A) Uninfected liver stained for B cells. (B) Uninfected liver stained for T cells. (C) Liver from a bird at 7 dpi, showing little change in the number of B lymphocytes. (D) Increased number of scattered CD3⁺ T cells in the liver of an infected bird at 7 dpi. (E) Little change in the number of B lymphocytes in the liver at 14 dpi. (F) Increased numbers of scattered T cells remaining in the liver at 14 dpi.