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Role and antimicrobial resistance of staphylococci involved in prosthetic joint infections

Staphylococci are responsible for approximately half of all prosthetic joint infections (PJIs) and they are often multi-drug resistant. The main purpose of this study was to evaluate the incidence of PJIs caused by staphylococci in our hospital from March 2010 to February 2012, with particular refer...

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Published in:International journal of artificial organs 2014-05, Vol.37 (5), p.414-421
Main Authors: Drago, Lorenzo, De Vecchi, Elena, Cappelletti, Laura, Mattina, Roberto, Vassena, Christian, Romanò, Carlo L
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container_title International journal of artificial organs
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description Staphylococci are responsible for approximately half of all prosthetic joint infections (PJIs) and they are often multi-drug resistant. The main purpose of this study was to evaluate the incidence of PJIs caused by staphylococci in our hospital from March 2010 to February 2012, with particular reference to antibiotic resistance in relation to their classification as contaminant or infecting isolates. We analyzed samples recovered from 124 patients: most of them were male (55.8%) and the mean age was 66 ± 14 years. Prostheses derived from hip (54.8%) or knee (45.2%) replacement and they were processed by sonication. Isolates were identified using conventional biochemical methodologies. Antimicrobial susceptibility testing was carried out using the disk diffusion method as described by the European Committee on Antimicrobial Susceptibility Testing. A total of 135 staphylococci were isolated: the prevalent species was Staphylococcus aureus, but, on the whole, coagulase-negative staphylococci represented 57% of cases. Fifty-one isolates were recovered from a single sample and were therefore defined as contaminant. Linezolid and glycopeptides showed excellent activity versus all the tested isolates, while penicillin, levofloxacin, and erythromycin offered reduced activity against staphylococci. Interestingly, high resistance rates were observed for coagulase-negative staphylococci other than S. epidermidis classified as contaminant strains. We observed a remarkable spread of coagulase-negative staphylococci as causative agents of PJIs; but most of them were classified as contaminants. However, because of their low susceptibility to the antibiotics tested, further studies are necessary to evaluate their role as pathogens or as true contaminants.
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subjects Adult
Aged
Anti-Infective Agents - therapeutic use
Antibiotics
Antiinfectives and antibacterials
Contaminants
Drug Resistance, Microbial
Female
Hip Prosthesis - adverse effects
Hip Prosthesis - microbiology
Humans
Knee Prosthesis - adverse effects
Knee Prosthesis - microbiology
Male
Middle Aged
Patients
Penicillin
Prevalence
Prostheses
Prosthesis-Related Infections - drug therapy
Prosthesis-Related Infections - epidemiology
Prosthesis-Related Infections - microbiology
Prosthetics
Spreads
Staphylococcal Infections - drug therapy
Staphylococcal Infections - epidemiology
Staphylococcal Infections - etiology
Staphylococcus - classification
Staphylococcus - isolation & purification
Staphylococcus aureus
title Role and antimicrobial resistance of staphylococci involved in prosthetic joint infections
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