ArticleEuropean journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology2026
Risk factors for multidrug resistance and mortality in healthcare-associated neonatal gram-negative bloodstream infections.
Article in European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThis study aimed to characterize pathogen distribution and antimicrobial resistance patterns of gram-negative bloodstream infections in a tertiary neonatal intensive care unit and to determine which factors were associated with multidrug resistance (MDR) and 28-day mortality.
methodsIn this retrospective cohort study, 197 neonates with healthcare-associated gram-negative bloodstream infections diagnosed between January 2010 and December 2025 were included. Demographic, perinatal, clinical, and microbiological data were extracted from electronic medical records. Factors associated with MDR infection and 28-day mortality were evaluated using univariable and multivariable logistic regression analyses.
resultsOf the 197 neonates, 114 (57.9%) had MDR gram-negative bloodstream infections. Klebsiella spp. was the most frequently isolated pathogen (51.3%), followed by Acinetobacter spp. (23.9%) and Escherichia coli (14.7%). Extended-spectrum beta-lactamase production was detected in 68.6% of isolates, MDR in 57.9%, and carbapenem resistance in 39.1%. Acinetobacter spp. showed the highest rates of carbapenem resistance (95.7%) and MDR (97.9%). In multivariable analysis, older postnatal age at infection onset, mechanical ventilation, and previous carbapenem exposure were independently associated with MDR infection, whereas appropriate empirical therapy was protective. Overall, 83 neonates (42.1%) died within 28 days. Mechanical ventilation and inotropic support were independently associated with mortality, while appropriate empirical therapy remained independently protective. MDR status and pathogen distribution were not independently associated with mortality.
conclusionNeonatal gram-negative bloodstream infections were characterized by a high burden of MDR. Mortality was more strongly related to indicators of illness severity than to microbiological resistance profiles. Appropriate empirical therapy was protective against both MDR infection and 28-day mortality.
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