Fig. 2
Pathogenicity and immunogenicity of the E. maxima precocious line BJ-PL-98. Average body weight gains of birds (n = 3) were measured 7 (a) and 14 (b) days after inoculation with three different doses of BJ-PL-98 and BJ-WT-130. The total oocyst output of birds was measured after immunization (c) and challenge (d) with different doses and strains of E. maxima. UUC: unimmunized and unchallenged; UC: unimmunized but challenged with BJ-WT-130 (1 × 105 oocysts/bird); Shandong strain group, Hebei strain group and P-200 group: immunized with BJ-PL-98 (200 oocysts/bird), and challenged with 1 × 105 oocysts/bird using Shandong strain, Hebei strain and BJ-WT-130, respectively. P-500 group: immunized with BJ-PL-98 (500 oocysts/bird) and challenged with BJ-WT-130 (1 × 105 oocysts/bird). W-200 and W-500 groups: birds were immunized with 200 and 500 BJ-WT-130 oocysts each, respectively, and challenged with BJ-WT-130 (1 × 105 oocysts/bird). Asterisks represent p < 0.05, ns means not statistically significant (p > 0.05)