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A. Cecum, contact duckling group 1 (4.3 x 108 IFU/mL). Immunohistochemistry, positive labeling of chlamydial inclusions in the cecal epithelium and sub-epithelial tissue. B. Lung, contact duckling group 1 (4.3 x 108 IFU/mL). Immunohistochemistry revealed chlamydial inclusions in the ciliated epithelium of a bronchus (AEC/peroxidase method, hematoxylin counterstain).
