Figure 3
Serum and mucosal IgA. Mean (± s.e) OD values for IgA in: a) serum and b) mucosa of Suffolk (shaded bar) and Texel (clear bar) lambs following infection with 3 × 104 L3 of T. circumcincta. The asterisks on the bars indicate the significance of the difference from the mean at day 0 for each breed (*P < 0.05, **P < 0.01).