IL6 and bacterial infectious disease: Levels of IL-6 greater than 35.0 pg/mL, representing a range of bacterial infection very likely, had 0.35 specificity for true bacterial infection according to microbiologic data; values of 10.5 to 35.0 pg/mL, representing a range of bacterial infection possible, had 0.70 specificity (eTable 2 in the Supplement).