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SEM of tracheae incubated with B. avium. Tracheal rings were incubated with approximately 109 bacteria/ml for 3 h under the same conditions as used for the tracheal attachment assay. (A) Parental strain 197N. (B) Mot− mutant, strain G146. (C) Dnt− mutant, strain WBA16. (D) Hag− mutant, strain P206. All images are shown at the same magnification. Bar, 1 μm.
