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《Journal of Medical Forum》 2007-05
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Evaluation of Coagulase-Negative Staphylococci in Blood Culture

ZHANG Hongsheng The People's Hospital of Anyang City, Anyang 455000,China  
Objective To investigate the contamination incidence of coagulase-negative staphylococci (CNS) in blood culture. Methods Retrospectively analyze coagulase-negative staphylococci in blood culture from 97 hospitalized patients at our Hospital from 2004 to 2006. We differentiated true bacteremia from contamination by using a criterion reviewed from published papers. Results48/97(49.5%) of cases was bacteremia due to CNS. 24 strains (50.0%) were related to catheters using and foreign bodies, 8 (16.7%) related to postoperative wounds, 5(10.4%) related to breath way, 5(10.4%) related to umbilicus, 1 related to eye infection. The rest 5 strains were unkown. Most of 48 cases of bacteremia were from intensive care units, neonatal ward,surgeon wards and hematology ward. 24 strains from 67 of CNS (35.8%) isolated from bloodstream within 49 hours,All 16 strains isolated after 48 hours were contaminants. The time to positive for contaminants was significantly longer than that for true pathogens (32.2 h/20.6h,P0.01). The resistance to penicillin, oxacillin, gentamicin ciprofloxacin and vancomycin were no significant difference between contaminants and pathogens (P0.25). 19 of 24 cases of true bacteremia due to catheters and foreign bodies were cured after only removal of catheters and foreign bodies, and the rest 5 cases were cured by both administering vancomycin and removing catheters. Conclusion The contamination incidence of CNS in blood culture was relatively high. We should determine true bacteremia from contamination by reviewing the clinical, epidemiological and laboratory information, which would be helpful to avoid abuse of antimicrobials, especially vancomycin.
【CateGory Index】: R446.5
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