683: UTILITY OF PROCALCITONIN TO DIFFERENTIATE GRAM-POSITIVE AND GRAM-NEGATIVE INFECTIONS IN THE PICU.

B Learning Objectives: b Gram-positive (GP) and gram-negative (GN) bacteria activate different Toll-like receptors signaling pathways resulting in production of different proinflammatory cytokines that stimulate procalcitonin (PCT) release. The aim of this study was to evaluate whether PCT can discriminate infections caused by GP and GN organisms in a PICU cohort. [Extracted from the article]