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In situ assessment of the presence of Mtb H37Rv in mediastinal lymph nodes at different time points after intratracheal inoculation. Days 1 (a), 3 (b), 7 (c), and 14 (d).Arrows in d indicate the Ziehl–Neelsen+ (red colour) bacilli. Magnification: (a–c) 20×, (d) 40×.
