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Phagocytic activities ((A) phagocytic index, (B) percent phagocytosis) of pronephric macrophages of silver sea bream (N = 7) immunized with formalin-killed bacterins via different administration routes. Significant differences from control were expressed as ** p < 0.01 and *** p < 0.001. Significant differences among groups of immunized fish were shown as a, b, and c (a > b > c).
