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Neonatal Escherichia coli Bloodstream Infections: Clinical Outcomes and Impact of Initial Antibiotic Therapy #MMPMID26065862
Bergin SP; Thaden J; Ericson JE; Cross H; Messina J; Clark RH; Fowler VG; Benjamin DK; Hornik CP; Smith PB
Pediatr Infect Dis J 2015[Sep]; 34 (9): 933-6 PMID26065862show ga
Background: Escherichia coli is a common cause of bloodstream infections (BSI) in infants and is associated with high mortality and morbidity among survivors. The clinical significance of antibiotic resistance and timing of appropriate antimicrobial therapy in this population is poorly understood. Methods: We identified all infants with E. coli BSIs discharged from 77 neonatal intensive care units managed by the Pediatrix Medical Group in 2012. We used multivariable logistic regression to evaluate the association between 30-day mortality and ampicillin-resistant E. coli BSI, as well as the number of active empiric antimicrobial agents administered, controlling for gestational age, small-for-gestational age status, early- versus late-onset BSI, oxygen requirement, ventilator support, and inotropic support on the day of the first positive blood culture. Results: We identified 258 episodes of E. coli BSI, including 123 (48%) ampicillin-resistant isolates. Unadjusted 30-day mortality did not significantly differ between infants with ampicillin-resistant vs. -susceptible E. coli BSI (11/123 [9%] vs. 7/135 [5%]; p=0.33; adjusted odds ratio=1.37 [95% confidence interval 0.39, 4.77]). Among ampicillin-resistant E. coli BSIs, 30-day mortality was not significantly lower for infants treated with at least one empiric antimicrobial active against ampicillin-resistant E. coli vs. infants receiving no active empiric agent (adjusted odds ratio=1.50 [0.07, 33.6]). Conclusions: In this population of infants with E. coli BSI, ampicillin resistance was not associated with significantly increased mortality. Among the subset of infants with ampicillin-resistant E. coli, appropriate empirical antibiotic therapy was not associated with lower mortality.