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Gross pathology of selected lung specimens at necropsy. Specimens shown in the upper and lower parts of each panel are paired. The lower parts show dissected cavity lesions. Panels: A, M. bovis Ravenel, rabbit R6; B, M. tuberculosis H37Rv, rabbit H1; C, M. tuberculosis CDC1551 ΔsigC mutant, rabbit SC1. In each panel, the most significant cavitary areas are located at the primary site of infection, in the right lower lobe.
