The expression of 277 genes was induced >2-fold in a statistically significant manner by infection with Mtb:Δ-sigH at the 0 hr time-point(Table S1-D) Some of the genes with the greatest induction included CCL4 (17.6-fold), CXCL2 (10-fold), CCL7 (6.5-fold) and CCL20 (4.3-fold). The gene discussed is CXCL2; the disease is infection.