Antimicrobial activity against B. anthracis spores during infection is consistent with the previously reported association between CXCL9, CXCL10, and CXCL11 induction and decreased spore germination in vivo [22], as well as observations that the reduction of spore burden on resident macrophages is important in preventing intracellular vegetative outgrowth and subsequent disease progression [46]. Here, CXCL9 is linked to infection.