period of time and had a worse clinical outcome, as evidenced by > hemodynamic instability, > sepsis, CRP > 90 mg/L for a longer time, more days of hospitalization, > frequency of hospitalization in ICU, > bacteremia, mainly by Streptococcus viridans group, > change of antimicrobial treatment, > use of antifungal therapy. Conclusions: This study demonstrates that FN episodes in children with ALML further evolve unfavorably, compared with episodes of FN in children with ALL. FN episodes in children with ALML require a more aggressive diagnostic and therapeutic approach, related to its severity.]]>