• Elsa Da Palma Afonso and Stijn Blot.
• a Neonatal Intensive Care Unit , Rosie Hospital, Cambridge University Hospitals , Cambridge , UK.
• Expert Rev Anti Infect Ther. 2017 Oct 1; 15 (10): 917-924.

IntroductionNeonatal sepsis is a major cause of morbidity and mortality. Late-onset sepsis affects a significant percentage of infants admitted to the neonatal intensive care unit (NICU). Most affected newborns are preterm or low birth weight, but late-onset sepsis also affects late preterm and term infants. Understanding how gestational age affects the epidemiology of late-onset sepsis can be of use when defining strategies for its prevention and clinical management in NICU. Areas covered: Available evidence suggests the incidence and mortality of late-onset sepsis is higher in preterm and VLBW infants, but pathogen distribution and risk exposure is similar across all infants admitted to NICU. More research is required for late-onset sepsis in late preterm and term infants admitted to NICU. There is some research insight on the impact of gut bacteria in the epidemiology of Gram-negative sepsis, which could benefit from further dedicated studies. Expert commentary: Understanding the manner in which some infants develop severe sepsis and others don't and what the long-term outcomes are is fundamental to guide management strategies. Further research should focus both on infants' characteristics and on pathogenic processes. The ultimate goal is to be able to design guidelines for prevention and management of sepsis that are adapted to a varied neonatal population.

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