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Susceptibility to chlorhexidine amongst multidrug-resistant clinical isolates of Staphylococcus epidermidis from bloodstream infections

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journal contribution
posted on 11.01.2018, 11:09 by Karolin Hijazi, Indrani Mukhopadhya, Felicity Abbott, Kathleen Milne, Zaaima J. Al-Jabri, Marco R. Oggioni, Ian M. Gould
The emergence of Staphylococcus isolates with reduced susceptibility to chlorhexidine is being increasingly reported. We present an update to a previous report showing the continuing efficacy of chlorhexidine-based infection control measures against Staphylococcus aureus over 6 years. In this study, qacA/B genes were screened in Staphylococcus isolates collected over another 6 years in the same intensive care unit in Scotland where chlorhexidine baths form an essential component of long-term control of nosocomial infections. Consistent with our previous study, we report minimal presence of qacA/B in S. aureus strains from screening samples and bacteraemia patients but the new finding of a high proportion of qacA/B carriage in Staphylococcus epidermidis associated with reduced susceptibility to chlorhexidine. S. epidermidis isolates positive for qacA/B were clonally diverse, although 65% of isolates belonged to the multidrug-resistant (MDR) clone ST2. These findings raise concerns in relation to the selection of MDR strains by chlorhexidine and are important in the context of recent evidence emphasising the benefits of targeting bloodstream infections associated with coagulase-negative staphylococci.

History

Citation

International Journal of Antimicrobial Agents, 2016, 48 (1), pp. 86-90

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/MBSP Non-Medical Departments/Department of Genetics

Version

AM (Accepted Manuscript)

Published in

International Journal of Antimicrobial Agents

Publisher

Elsevier for International Society of Chemotherapy

issn

0924-8579

eissn

1872-7913

Acceptance date

16/04/2016

Available date

11/01/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S0924857916300930?via=ihub

Language

en