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Background and Aims  Neonatal infections caused by Extended-spectrum beta-lactamase (ESBL)-producing bacteria are associated with increased morbidity and mortality. No data are available on neonatal colonization with ESBL-producing bacteria in Ecuador. The aim of this study was to determine the proportion of intestinal colonization with ESBL-producing  Enterobacteriaceae , their resistance pattern and risk factors of colonization in a neonatal intensive care unit in Ecuador.    Methods  During a three month period, stool specimens were collected every two weeks from hospitalized neonates. Species identification and susceptibility testing were performed with Vitek2, epidemiologic typing with automated repetitive PCR. Associations between groups were analyzed using the Pearson  X   2  test and Fisher exact test. A forward step logistic regression model identified significant predictors for colonization.    Results  Fifty-six percent of the neonates were colonized with ESBL-producing  Enterobacteriaceae . Length of stay longer than 20 days and enteral feeding with a combination of breastfeeding and formula feeding were significantly associated with ESBL-colonization. The strains found were  E. coli  (EC, 89%) and  K. pneumoniae  (KP, 11%) and epidemiological typing divided these isolates in two major clusters. All EC and KP had  bla   CTX-M  group 1 except for a unique EC isolate that had  bla   CTX-M  group 9. Multi-locus sequence typing performed on the  K. pneumoniae  strains showed that the strains belonged to ST855 and ST897. The two detected STs belong to two different epidemic clonal complexes (CC), CC11 and CC14, which previously have been associated with dissemination of carbapenemases. None of the  E. coli  strains belonged to the epidemic ST 131 clone.    Conclusions  More than half of the neonates were colonized with ESBL-producing  Enterobacteriaceae  where the main risk factor for colonization was length of hospital stay. Two of the isolated clones were epidemic and known to disseminate carbapenemases. The results underline the necessity for improved surveillance and infection control in this context.

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High Proportion of Intestinal Colonization with Successful Epidemic Clones of ESBL-Producing Enterobacteriaceae in a Neonatal Intensive Care Unit in Ecuador