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Unlabelled: Sepsis is the major cause of morbidity and mortality in children, especially in immunocompromised patients, and a rapid identification of causative pathogen is strongly related with a better outcome. This prospective study analyzes the role of a multiplex real-time polymerase chain reaction in sepsis' etiological diagnosis. Magicplex(TM) Sepsis Real-Time tests were performed in tertiary Regina Margherita Children's Hospital (Turin, Italy), and the medical records of children who underwent a Magicplex test were prospectively evaluated. Results of the Magicplex test were compared with those of blood culture collected at a close time point. One hundred fifty Magicplex tests were collected from 89 patients (54 males and 35 females, age interquartile range: 2.6-12.1 years). Etiological definition was achieved in 60 bloodstream infection cases (40 %). In 32 episodes, Magicplex test alone gave a positive result, and blood culture alone permitted the etiological diagnosis in 5 septic episodes. Magicplex test allowed a 143 % increase in the diagnostic value of blood cultures.Conclusion: These results suggest that molecular biology can be useful for rapid pathogen's identification also in children.What Is Known: • Sepsis represents a major cause of morbidity and mortality in children. • Sepsis outcome is strongly related to rapid microbiological identification and prompt initiation of an appropriate chemotherapy. What is New: • This manuscript is the first that describes the use of Magicplex (TM) Sepsis Real-Time test in children. • The results suggest that molecular biology can be useful for rapid pathogen's identification also in children. [ABSTRACT FROM AUTHOR]