Fig. 3
Numbers of IgA antibody-secreting cells pre- and post-challenge. The numbers of IgA antibody secreting cells (ASCs) per 5 × 105 MNCs in blood, spleen, mesentery lymph nodes and ileum of mock-, P100C4-, P120- or P3-inoculated weaned pigs. Samples were collected at 21–23 days post-inoculation (dpi; before challenge; n = 2 per group) and at 35–37 dpi/11–13 days post-challenge (dpc; after challenge; n = 4 per group). Different letters indicate significantly different numbers of ASCs among the treatment groups (p < 0.05)