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Mean avidity of sera against sporozoite (Sz) and merozoite (Mz) antigens in SPF chicks at 3 days of age (Pool I, II, and III) and antibody response at 21 days of age in the chicks immunized with whole sporozoites of E. tenella, chicks mock-injected, unimmunized SPF birds (−), and positive reference sera (+). Bars represent mean OD (± SD). Different letters (A, B, or C) in sporozoite or merozoite antigens of E. tenella indicate statistical differences at p < 0.05.
