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Spatial Analysis of Community-Onset Staphylococcus aureus Bacteremia in Queensland, Australia

Published online by Cambridge University Press:  02 January 2015

John Marquess ,
Wenbiao Hu ,
Graeme R. Nimmo  and
Archie C. A. Clements
John Marquess*
Affiliation:
Centre for Healthcare Related Infection Surveillance and Prevention, Herston, Brisbane, Queensland, Australia University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Herston, Brisbane, Queensland, Australia
Wenbiao Hu
Affiliation:
University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Herston, Brisbane, Queensland, Australia
Graeme R. Nimmo
Affiliation:
Pathology Queensland Central Laboratory, Herston, Brisbane, Queensland, Australia Griffith University School of Medicine, Gold Coast, Queensland, Australia
Archie C. A. Clements
Affiliation:
University of Queensland, Infectious Disease Epidemiology Unit, School of Population Health, Herston, Brisbane, Queensland, Australia
*
Centre for Healthcare Related Infection Surveillance and Prevention, Chief Health Officer Branch, 15 Butterfield Street, Herston, Brisbane QLD 4006, Australia
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Abstract

Objectives.

TO investigate and describe the relationship between indigenous Australian populations, residential aged care services, and community-onset Staphylococcus aureus bacteremia (SAB) among patients admitted to public hospitals in Queensland, Australia.

Design.

Ecological study.

Methods.

We used administrative healthcare data linked to microbiology results from patients with SAB admitted to Queensland public hospitals from 2005 through 2010 to identify community-onset infections. Data about indigenous Australian population and residential aged care services at the local government area level were obtained from the Queensland Office of Economic and Statistical Research. Associations between community-onset SAB and indigenous Australian population and residential aged care services were calculated using Poisson regression models in a Bayesian framework. Choropleth maps were used to describe the spatial patterns of SAB risk.

Results.

We observed a 21% increase in relative risk (RR) of bacteremia with methicillin-susceptible S. aureus (MSSA; RR, 1.21 [95% credible interval, 1.15–1.26]) and a 24% increase in RR with nonmultiresistant methicillin-resistant S. aureus (nmMRSA; RR, 1.24 [95% credible interval, 1.13–1.34]) with a 10% increase in the indigenous Australian population proportion. There was no significant association between RR of SAB and the number of residential aged care services. Areas with the highest RR for nmMRSA and MSSA bacteremia were identified in the northern and western regions of Queensland.

Conclusions.

The RR of community-onset SAB varied spatially across Queensland. There was increased RR of community-onset SAB with nmMRSA and MSSA in areas of Queensland with increased indigenous population proportions. Additional research should be undertaken to understand other factors that increase the risk of infection due to this organism.

Type
Original Article
Information
Infection Control & Hospital Epidemiology , Volume 34 , Issue 3 , March 2013 , pp. 291 - 298
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2013

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