IL6 and susceptibility to pneumonia measurement: The PCT and IL-6 levels in patients with BSI were much higher than other sites, while the levels of CRP and IL-10 did not present a very significant difference in quantity although the p values were less than 0.05 (BSI vs. RTI & pneumonia vs. FUO vs. others, median levels: CRP, 87.2 mg/L vs.52.6 mg/L vs. 74.7 mg/L vs. 47.2 mg/L, p = 0.002; PCT, 0.89 ng/ml vs. 0.38 ng/ml vs. 0.43 ng/ml vs. 0.27 ng/ml, p = 0.002; IL-6, 397.3 mg/L vs. 107.9 mg/L vs.117.9 mg/L vs. 128.5 mg/L, p = 0.003; IL-10, 25.1 pg/ml vs. 12.0 pg/ml vs. 15.4 pg/ml vs. 10.7 pg/ml, p < 0.001).