Infect Chemother.  2016 Sep;48(3):160-165. 10.3947/ic.2016.48.3.160.

Extended-spectrum ß-Lactamase-producing Enterobacteriaceae as a Common Cause of Urinary Tract Infections in Sri Lanka

Affiliations
  • 1Duke Global Health Institute, Durham, NC, USA. gayani.tillekeratne@dm.duke.edu
  • 2Teaching Hospital Karapitiya, Galle , Sri Lanka.
  • 3Genetech Research Institute, Colombo, Sri Lanka.
  • 4Durham Veteran Affairs Medical Center, Durham, NC, USA.
  • 5Department of Microbiology, Ruhuna University Faculty of Medicine, Galle, Sri Lanka.
  • 6Department of Medicine, Ruhuna University Faculty of Medicine, Galle, Sri Lanka.

Abstract

BACKGROUND
Extended-spectrum ß-lactamase-producing Enterobacteriaceae (ESBL-PE) are increasingly reported as pathogens in urinary tract infections (UTIs). However, in Sri Lanka, the clinical and molecular epidemiology of ESBL-PE implicated in UTIs has not been well described.
MATERIALS AND METHODS
We conducted prospective, laboratory-based surveillance from October to December 2013 at a tertiary care hospital in southern Sri Lanka and enrolled patients ≥1 year of age with clinically relevant UTIs due to ESBL-PE. Isolate identity, antimicrobial drug susceptibility, and ESBL production were determined. Presence of ß-lactamase genes, bla(SHV), bla(TEM), and bla(CTX-M), was identified by polymerase chain reaction.
RESULTS
During the study period, Enterobacteriaceae were detected in 184 urine samples, with 74 (40.2%) being ESBL producers. Among 47 patients with ESBL-PE who had medical records available, 38 (80.9%) had clinically significant UTIs. Most UTIs (63.2%) were community acquired and 34.2% were in patients with diabetes. Among 36 cultured ESBL-PE isolates, significant susceptibility (>80%) was only retained to amikacin and the carbapenems. The group 1 bla(CTX-M) gene was present in 90.0% of Escherichia coli isolates and all Klebsiella pneumoniae and Enterobacter cloacae isolates. The bla(SHV) and bla(TEM) genes were more common in K. pneumoniae (75% and 50%) and E. cloacae (50% and 50%) isolates than in E. coli (10% and 20%) isolates, respectively.
CONCLUSION
The majority of UTIs caused by ESBL-PE were acquired in the community and due to organisms carrying the group 1 CTX-M ß-lactamase. Further epidemiologic studies of infections due to ESBL-PE are urgently needed to better prevent and treat these infections in South Asia.

Keyword

Extended-spectrum ß-lactamases; Enterobacteriaceae; Community-acquired urinary tract infections; Sri Lanka

MeSH Terms

Amikacin
Asia
Carbapenems
Cloaca
Enterobacter cloacae
Enterobacteriaceae*
Epidemiologic Studies
Escherichia coli
Humans
Klebsiella pneumoniae
Medical Records
Molecular Epidemiology
Pneumonia
Polymerase Chain Reaction
Prospective Studies
Sri Lanka*
Tertiary Healthcare
Urinary Tract Infections*
Urinary Tract*
Amikacin
Carbapenems

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