Update on the in vitro activity of daptomycin tested against 17,193 Gram-positive bacteria isolated from European medical centers (2005-2007).
The antimicrobial susceptibility patterns of 17,193 Gram-positive isolates consecutively collected from 28 medical centers in 12 countries in europe and israel in 2005-2007 were evaluated by Clinical and laboratory Standards institute (CLSI) broth microdilution methods supplemented with calcium to 50 mg/l for testing daptomycin. Overall, the rate of methicillin-resistant Staphylococcus aureus (MRSA) was 28.3%, varying from 32.3% in 2005 to 27.1% in 2006 and 28.5% in 2007. Vancomycin resistance rates were 0.8% and 21.5% among Enterococcus faecalis and E. faecium, respectively. Among E. faecium, vancomycin resistance increased from 17.9% in 2005 to 26.3% in 2007, and varied from 0.0% in Spain, Sweden and Switzerland to as high as 54.6% in ireland for 2007. All isolates tested, except for seven CoNS (0.2%; 3,234 tested) were considered susceptible to daptomycin using breakpoints established by the United States food and Drug Administration, the CLSI and the EUCAST. Daptomycin was very active against all Gram-positive species with the highest minimum inhibitory concentration (MIC) results being 1, 4, 2 and 4 mg/l for S. aureus, coagulase-negative staphylococci, E. faecalis and E. faecium, respectively. Daptomycin activity was not adversely influenced by resistance to oxacillin among staphylococci or to vancomycin among enterococci.
Sader
H S
HS
JMI Laboratories, North Liberty, Iowa 52317, USA. helio-sader@jmilabs.com
Moet
G
G
Jones
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RN
D000046:Academic Medical Centers; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D017576:Daptomycin / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D005060:Europe; D006094:Gram-Positive Bacteria / Q000187:drug effects* / Q000302:isolation & purification; D016908:Gram-Positive Bacterial Infections / Q000382:microbiology; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000302:isolation & purification; D008826:Microbial Sensitivity Tests
D000900:Anti-Bacterial Agents; D017576:Daptomycin