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Representative ceca from treated birds. (A) Predatory HD Bdellovibrio-treated bird; (B) nonpredatory HI ΔpilA Bdellovibrio-treated bird; (C and D) control birds. Scale bars, 5 cm. Normal ceca contain dark free-flowing fecal material, but Salmonella infection is widely reported (1, 2, 16, 36, 42) to cause pale ceca with dense non-free-flowing contents due to inflammation and white blood cell infiltration.
