Molecular epidemiology of Pseudomonas aeruginosa bloodstream infection isolates in a non-outbreak setting

McCarthy, Kate L., Kidd, Tim J. and Paterson, David L. (2017) Molecular epidemiology of Pseudomonas aeruginosa bloodstream infection isolates in a non-outbreak setting. Journal of Medical Microbiology, 66 2: 154-159. doi:10.1099/jmm.0.000413


Author McCarthy, Kate L.
Kidd, Tim J.
Paterson, David L.
Title Molecular epidemiology of Pseudomonas aeruginosa bloodstream infection isolates in a non-outbreak setting
Formatted title
Molecular epidemiology of Pseudomonas aeruginosa bloodstream infection isolates in a non-outbreak setting
Journal name Journal of Medical Microbiology   Check publisher's open access policy
ISSN 0022-2615
1473-5644
Publication date 2017-02-01
Sub-type Article (original research)
DOI 10.1099/jmm.0.000413
Open Access Status Not yet assessed
Volume 66
Issue 2
Start page 154
End page 159
Total pages 6
Place of publication London, United Kingdom
Publisher Microbiology Society
Collection year 2018
Language eng
Formatted abstract
Purpose: The molecular epidemiology of Pseudomonas aeruginosa bloodstream infection (BSI) isolates has received limited attention. This study aims to characterize the molecular relationship of P. aeruginosa BSI isolates in the non-outbreak setting at a single tertiary healthcare facility.

Methodology: P. aeruginosa BSI isolates from patients who were admitted to the Royal Brisbane and Women’s Hospital over a 13 month period from November 2009 were identified retrospectively from the Pathology Queensland Clinical and Scientific Information System. The isolates were typed by the iPLEX MassARRAY matrix assisted lazer desorption/isonisation time of flight (MALDI-TOF) MS genotyping. The DiversiLab automated rapid strain typing platform (bioMérieux) was used to assess the genotypic relationships between study isolates that showed indistinguishable iPLEX20SNP profiles. Clinical data was also collected retrospectively from patient notes.

Results: Fifty-three P. aeruginosa BSI episodes were available for study. Thirty-five different clones or clonal complexes were identified by the iPLEX MassARRAY MALDI-TOF MS genotyping. Seventeen BSI isolates with indistinguishable iPLEX20SNP profiles underwent further DiversiLab genotyping and were found to belong to a further 13 different genotypes. There was no relationship between clonality and acquisition type, source of infection or length of stay in the setting of hospital-acquired infection.

Conclusion: The non-clonal population structure suggests that there is ongoing environmental exposure of inpatients to P. aeruginosa. In clinical areas dealing with at-risk patients, routine attention to mechanism of environmental colonization is important and should be addressed even in the non-outbreak setting.
Keyword Bacteraemia
Blood steam infection
Molecular epidemiology
P. aeruginosa
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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