Coagulase-negative Staphylococcus bacteraemia accounts for one third of Staphylococcus bacteraemia in a French university hospital.
BACKGROUND
We sought to determine the epidemiological patterns of Staphylococcus bacteraemia, with a focus on the proportion of coagulase-negative Staphylococcus (CoNS) as compared to Staphylococcus aureus bacteraemia, and the prognosis.


METHODS
All patients with significant Staphylococcus bacteraemia at the university hospital in Reims in 2008 were included in the study. Data were retrieved retrospectively from the patient records using a standardized case investigation form. Quantitative variables were compared using the Mann-Whitney U-test and qualitative variables were compared using Fisher's exact test or Pearson's Chi-square test, as appropriate. Bivariate logistic regression was performed on both S. aureus and CoNS bacteraemia. All variables with a p-value of < 0.15 were entered into a multiple logistic regression model.


RESULTS
CoNS represented 31.6% of all strains isolated. The methicillin resistance rate was higher in CoNS (66.1%) than in S. aureus (19.1%) (p < 0.0001). CoNS were more frequently associated with intravascular catheters and neoplastic disease, whereas S. aureus was associated with chronic renal failure (p < 0.0001) and diabetes mellitus (p = 0.004). Mortality was 30.7% for S. aureus and 19.6% for CoNS bacteraemia (p = 0.12). Methicillin resistance was not associated with mortality (p = 0.99). Factors independently associated with mortality in CoNS and S. aureus bacteraemia were age and acute renal failure. The presence of severe sepsis/septic shock was only associated with mortality in S. aureus bacteraemia.


CONCLUSIONS
CoNS represent one third of Staphylococcus bacteraemia. The mortality difference between CoNS and S. aureus bacteraemia was not statistically significant. Acute renal failure is associated with mortality in both S. aureus and CoNS bacteraemia.
Service de Médecine Interne et Maladies Infectieuses, Hôpital Robert Debré, Avenue Général Koenig, Reims, France. yohan.nguyen@wanadoo.fr
Yohan
Y
N'Guyen
Sonia
S
Baumard
Véronique
V
Vernet-Garnier
Anne Sophie
AS
Batalla
Christophe
C
de Champs
Roland
R
Jaussaud
Christophe
C
Strady
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016470:Bacteremia / Q000453:epidemiology* / Q000382:microbiology*; D005260:Female; D005602:France / Q000453:epidemiology; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013203:Staphylococcal Infections / Q000453:epidemiology* / Q000382:microbiology*; D013210:Staphylococcus / Q000145:classification*; D055815:Young Adult