CXCL10 and anthrax infection: Whereas infected control animals showed low or undetectable levels of LF, serum collected from spore-challenged animals receiving CXCL9/CXCL10/CXCL11 neutralizing sera was found to contain concentrations of active LF ranging from 25–400 ng/ml (Figure 6), levels commensurate with concentrations measured from the sera of nonhuman primates that have succumbed to inhalational anthrax [30].