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Volume 48, Number 4, August 2015

Clinical experience and microbiologic characteristics of invasive Staphylococcus lugdunensis infection in a tertiary center in northern Taiwan 


Jung-Fu Lin, Chun-Wen Cheng, An-Jing Kuo, Tsui-Ping Liu, Chien-Chang Yang, Ching-Tai Huang, Ming-Hsun Lee, Jang-Jih Lu


Received: October 16, 2013    Revised: December 18, 2013    Accepted: February 17, 2014   

 

Corresponding author:

Jang-Jih Lu
Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, Taiwan
Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
Correspondence
Corresponding author. Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Number 5, Fu-Shin Street, Gueishan 333, Taoyuan, Taiwan.
 



 

Background and purpose: 

Staphylococcus lugdunensis is a coagulase-negative staphylococcus that cannot be ignored. This study is a comprehensive analysis of the clinical and microbiological characteristics of S. lugdunensis bacteremia and sterile site infection during hospitalization. 



 

Methods:

This retrospective study included 48 patients with invasive S. lugdunensis infection. During the period of March 2002 to July 2012, they had been hospitalized in a tertiary center of northern Taiwan. Demographics, clinical characteristics, and risk factors of mortality were analyzed. All isolates were tested for antimicrobial susceptibility. We identified the staphylococcal cassette chromosome mec (SCCmec) gene for oxacillin nonsusceptible isolates. 



 

Results:

The incidence of S. lugdunensis in coagulase-negative staphylococci bacteremia was 0.87%. Forty-eight patients were enrolled: S. lugdunensis was present in 41 patients with bacteremia, in the ascites of three patients, in the synovial fluid of two patients, in the pleural effusion of one patient, and in the amniotic fluid of one patient. The three most common sources of infection were primary bacteremia (43.8%), catheter-related infection (18.8%), and vascular graft infection (12.5%). All-cause mortality during hospitalization was 20.8% (10/48). All deceased patients were bacteremic. Risk factors associated with in-hospital mortality included a Pittsburgh bacteremia score of 2 or greater, infective endocarditis, and end-stage renal disease. Ten (20.8%) isolates were resistant to oxacillin, and 8 isolates were classified as SCCmec type V. 



 

Conclusion:

The clinical significance of S. lugdunensis should not be ignored, especially in patients with severe comorbidities. An aggressive search for endocarditis is strongly suggested in S. lugdunensis bacteremic cases. 



 

Key words:

Bacteremia, Endocarditis, SCCmec type, Staphylococcus lugdunensis