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Effect of additional antigen on the granulomatous response in the lungs of mice at 3 weeks post-aerosol infection with viable M. tuberculosis (live) or viable plus heat-killed M. tuberculosis (live + dead, 1:1). G, granuloma; ∗, distended alveolar spaces (edematic lung). Ziehl-Neelsen stain, magnification, ×10.
