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 chlorhexidinebased 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.
Susceptibility to chlorhexidine in multidrug resistant clinical isolates of Staphylococcus epidermidis from bloodstream infections / Hijazi K; Mukhopadhya I; Abbott F; Milne K; Al-Jabri ZJ; Oggioni MR; Gould IM. - In: INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS. - ISSN 0924-8579. - STAMPA. - 48:1(2016), pp. 86-90. [10.1016/j.ijantimicag.2016.04.015]
Susceptibility to chlorhexidine in multidrug resistant clinical isolates of Staphylococcus epidermidis from bloodstream infections
Oggioni MR;
2016
Abstract
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 chlorhexidinebased 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.