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Association of bacteria specifically stained with somatic anti-E. coli O157 sera during the first 5 days of experimental infection. Magnification, ×1,000. Cecal tissue from SPF chicks dosed orally by gavage with wild-type NCTC12900 (A), isogenic intimin-deficient mutant DM3 (B), isogenic flagellum-deficient DM4 (C), and isogenic intimin-flagellum-deficient mutant DM5 (D) are shown.
