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Liver sections of chickens infected via air sac inoculation with virulent wild-type strains or iron acquisition mutants. Magnification,×400. Liver sections of chickens infected with E058 (A), E058ΔchuT (B), E058ΔiroD (C), E058ΔiucD (D), E058ΔchuTΔiroDΔiucD (E), U17 (F), U17ΔchuT (G), U17ΔiroD (H), U17ΔiucD (I), U17ΔchuTΔiroDΔiucD (J). Liver section of a mock bird (K).
