CXCL9 and Q fever: Further analysis of the CXCR3-chemokine serum concentrations revealed that samples taken within one month after diagnosis of chronic Q fever (n = 9) were significantly higher for CXCL9 (p < 0.05) and CXCL10 (p < 0.05) than samples taken more than 1 month after diagnosis (n = 41).