(D) C57BL/6J or Tlr2-/- mice were infected with ~200 cfu of the indicated Mtb strains; 42 days post-infection, mice were euthanized and lungs were harvested and plated in serial dilutions to determine CFU Mean ± SD for five mice per condition (one C57BL6/ppsD plate discarded for mold contamination – four replicates for that condition). Here, TLR2 is linked to infection.