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BMC Infectious Diseases
Published in: BMC Infectious Diseases 1/2013

Open Access 01-12-2013 | Research article

Predominance of Klebsiella pneumoniaeST14 carrying CTX-M-15 causing neonatal sepsis in Tanzania

Authors: Stephen E Mshana, Torsten Hain, Eugen Domann, Eligius F Lyamuya, Trinad Chakraborty, Can Imirzalioglu

Published in: BMC Infectious Diseases | Issue 1/2013

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Abstract

Background

Klebsiella pneumoniae strains expressing ESBLs are a predominant cause of hospital acquired infections. Here we describe the molecular epidemiology of these isolates in a tertiary hospital in Tanzania, as potential pathogens for neonatal infections.

Methods

Between April 2009 and March 2010 all Klebsiella pneumoniae isolates with phenotypic expression Extended Spectrum Beta Lactamase (ESBL) were collected and characterized. Identification was done using in house biochemical tests in case of ambiguous results confirmation was done using API 20E. Susceptibility testing was determined using the disc diffusion method followed by specific PCR and sequencing to determine ESBL genes. Phylogenetic analysis, Pulse field gel electrophoresis (PFGE) and Multi-Locus sequence typing (MLST) to PFGE clusters representative isolates were performed to determine clones of the isolates. Conjugation and hybridization were performed to determine the location of blaCTX-M-15 gene.

Results

A total of 92 non- repetitive ESBL producing K. pneumoniae representing 50.3% of Klebsiella pneumoniae isolates were characterized. These isolates were from blood 61 (66%), wound swab 13 (14%), urine 12 (13%) and pus 6 (7%) were analyzed. Most blood culture strains originated from neonatal unit 39/61(64%) and 22 (36%) of the blood culture isolates were from neonatal ICU. All isolates were resistant to gentamicin and 54% were resistant to ciprofloxacin. Using a similarity index of 80%, the isolates were assigned to thirteen clusters based on PFGE patterns and contained sub-clusters with identical strains indicating clonal outbreaks. Cluster X5, X7 and X8, and X9 were grouped into ST48, ST14 and ST348 respectively. Based on gyrA PCR- RFLP phylogenetic analysis all isolates were grouped as KpI. The predominant ESBL allele detected was bla CTX-M-15 which was found in 76% of isolates, followed by bla TEM-104 (19%), bla SHV-11 (3.2%) and bla TEM-176 (2%). The bla CTX-M-15 gene was located in multiple conjugative IncF plasmids ranging from 25 kb-485 kb in size.

Conclusion

The high prevalence of bla CTX-M-15 observed among ESBL producing K. pneumoniae in Tanzania, is possibly due to the spread of a common IncFII 145 kb plasmid and of certain clones such as ST14 and ST48. Furthermore the 485 kb plasmid detected is the largest plasmid reported to carry bla CTX-M-15 todate.
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Metadata
Title
Predominance of Klebsiella pneumoniaeST14 carrying CTX-M-15 causing neonatal sepsis in Tanzania
Authors
Stephen E Mshana
Torsten Hain
Eugen Domann
Eligius F Lyamuya
Trinad Chakraborty
Can Imirzalioglu
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2013
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/1471-2334-13-466

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