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PLoS One. 2014 Jun 4;9(6):e99045. doi: 10.1371/journal.pone.0099045. eCollection 2014.

Long-term molecular epidemiology of Staphylococcus epidermidis blood culture isolates from patients with hematological malignancies.

Author information

1
Department of Medicine, Division of Hematology, Örebro University Hospital, Örebro, Sweden; Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
2
Department of Laboratory Medicine, Clinical Microbiology, Örebro University Hospital, Örebro, Sweden.
3
Department of Laboratory Medicine, Clinical Microbiology, Örebro University Hospital, Örebro, Sweden; Faculty of Medicine and Health, Örebro University, Örebro, Sweden.

Abstract

Staphylococcus epidermidis is an important cause of bloodstream infections in patients with hematological malignancies. Knowledge of the long-term epidemiology of these infections is limited. We surveyed all S. epidermidis blood culture isolates from patients treated for hematological malignancies at the University Hospital of Örebro, Sweden from 1980 to 2009. A total of 373 S. epidermidis isolates were identified and multilocus sequence typing, staphylococcal chromosome cassette mec (SCCmec) typing and standard antibiotic susceptibility testing were employed to characterize these isolates. The majority of the isolates 361/373 (97%) belonged to clonal complex 2, and the 373 isolates were divided into 45 sequence types (STs); Simpson's Diversity Index was 0.56. The most prevalent STs were ST2 (243/373, 65%) and ST215 (28/373, 8%). Ninety three percent (226/243) of the ST2 isolates displayed either SCCmec type III or IV. ST2 and 215 were isolated during the entire study period, and together these STs caused temporal peaks in the number of positive blood cultures of S. epidermidis. Methicillin resistance was detected in 213/273 (78%) of all isolates. In the two predominating STs, ST2 and ST215, methicillin resistance was detected in 256/271 isolates (95%), compared with 34/100 (34%) in other STs (p<0.001). In conclusion, in this long-term study of patients with hematological malignancies, we demonstrate a predominance of methicillin-resistant ST2 among S. epidermidis blood culture isolates.

PMID:
24896826
PMCID:
PMC4045895
DOI:
10.1371/journal.pone.0099045
[Indexed for MEDLINE]
Free PMC Article

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