M.tuberculosis inhibit phagolysosome fusion in MACROPHAGE through CORD FACTOR

Also noteworthy:

Macrophages are attracted to the area of PPD exposure via the action of Th1 lymphocytes in patients previously exposed to MTB. They are the predominant cell type found at the site of PPD exposure (the area of skin injection at 48 hours, when it's read) and also in the lungs of patients with pulmonary tuberculosis.