Abstract:
:The emergence of glycopeptide reduced susceptibility and resistance in Staphylococcus aureus strains is a growing clinical problem that poses significant clinical challenges in treatment. Its development is a complex and novel process involving many subtle physiological changes in the micro-organism. Daptomycin is the first cyclic lipopeptide approved for clinical use. Unlike most other antimicrobials, a trend towards increased daptomycin resistance has not been reported, although several cases of daptomycin non-susceptibility have been reported. The present review will present the available evidence on daptomycin resistance of S. aureus, with particular attention to its development. In addition to a literature overview, we have compiled the reported cases of daptomycin non-susceptibility to shed light on possible clinical mechanisms of resistance. In the 36 reports describing 62 clinical cases, infections caused by meticillin-resistant S. aureus (MRSA) strains with a vancomycin minimum inhibitory concentration (MIC) between 1mg/L and 2mg/L often led to vancomycin treatment failure, which may be associated with the development of non-susceptibility to daptomycin. Additional evidence suggests that underdosage of daptomycin is an important clinical aspect that merits further study. The current analysis highlights the importance of determining the MIC when using vancomycin to treat patients with severe S. aureus infections and that when failure is suspected, testing for heterogeneous vancomycin-intermediate S. aureus (hVISA) may also be necessary. Whilst further investigation is needed, it can be hypothesised that MRSA strains become hVISA during prolonged bacteraemia, which may predispose to the development of daptomycin resistance.
journal_name
Int J Antimicrob Agentsjournal_title
International journal of antimicrobial agentsauthors
Stefani S,Campanile F,Santagati M,Mezzatesta ML,Cafiso V,Pacini Gdoi
10.1016/j.ijantimicag.2015.05.008subject
Has Abstractpub_date
2015-09-01 00:00:00pages
278-89issue
3eissn
0924-8579issn
1872-7913pii
S0924-8579(15)00211-3journal_volume
46pub_type
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