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bioRxiv · 10.1101/122416

Epidemiology of the multidrug-resistant ST131-H30 subclone among extraintestinal Escherichia coli collected from US children

Miles-Jay, A.·Weissman, S. J.·Adler, A. L.·Tchesnokova, V.·Sokurenko, E. V.·Baseman, J. G.·Zerr, D. M.
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Abstract

BackgroundE. coli ST131-H30 is a globally important pathogen implicated in rising rates of multidrug resistance among E. coli causing extraintestinal infections. Previous studies have focused on adults, leaving the epidemiology of H30 among children undefined.\n\nMethodsWe used clinical data and isolates from a case-control study of extended-spectrum cephalosporin-resistant E. coli conducted at four US childrens hospitals to estimate the burden and identify host correlates of infection with H30. H30 isolates were identified using two-locus genotyping; host correlates were examined using log-binomial regression models stratified by extended-spectrum cephalosporin resistance status.\n\nResultsA total of 339 extended-spectrum cephalosporin-resistant and 1008 extended-spectrum cephalosporin-susceptible E. coli isolates were available for analyses. The estimated period prevalence of H30 was 5.3% among all extraintestinal E. coli isolates (95% confidence interval [CI] 4.6%-7.1%); H30 made up 43.3% (81/187) of ESBL-producing isolates in this study. Host correlates of infection with H30 differed by extended-spectrum cephalosporin resistance status: among resistant isolates, age [≤]5 years was positively associated with H30 infection (relative risk [RR] 1.83, 95% CI 1.19-2.83); among susceptible isolates, age [≤]5 years was negatively associated with H30 (RR 0.48, 95% CI 0.27-0.87), while presence of an underlying medical condition was positively associated (RR 4.49, 95% CI 2.43-8.31).\n\nConclusionsST131-H30 is less common among extraintestinal E. coli collected from children compared to reported estimates among adults, possibly reflecting infrequent fluoroquinolone use in pediatrics; however, it is similarly dominant among ESBL-producing isolates. The H30 subclone appears to disproportionately affect young children relative to other extendedspectrum cephalosporin-resistant E. coli.\n\nSummaryST131-H30 was responsible for 5.3% of all extraintestinal E. coli infections and 43.3% of ESBL-producing extraintestinal E. coli infections among US children. The clinical and demographic correlates of infection with ST131-H30 differed between extended-spectrum cephalosporin-resistant and -sensitive isolates.

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Miles-Jay, A., Weissman, S. J., Adler, A. L., Tchesnokova, V., Sokurenko, E. V., Baseman, J. G., Zerr, D. M.. 2017-03-30. Epidemiology of the multidrug-resistant ST131-H30 subclone among extraintestinal Escherichia coli collected from US children. https://doi.org/10.1101/122416

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