Prevalence and regional variation in meticillin-resistant Staphylococcus aureus (MRSA) in the USA and comparative in vitro activity of tigecycline, a glycylcycline antimicrobial.
The Tigecycline Evaluation and Surveillance Trial (T.E.S.T.) is a surveillance study established in 2004 to monitor the activity of tigecycline, the first glycylcycline, and comparator agents [beta-lactams (including penicillins, cephalosporins and carbapenems), glycopeptides, tetracyclines, fluoroquinolones and oxazolidinones] against Gram-positive and Gram-negative pathogens worldwide. This report examines 1692 isolates of Staphylococcus aureus collected in the continental United States between January 2004 and September 2005. Meticillin-resistant S. aureus (MRSA) accounted for 52.0 % of isolates. Prevalence of MRSA by state ranged from 12.5 % in New Hampshire to 100 % in Kentucky. All isolates were susceptible to tigecycline, linezolid and vancomycin. In vitro, tigecycline was potent against both meticillin-susceptible S. aureus (MSSA) (MIC(50) and MIC(90)=0.12 microg ml(-1)) and MRSA (MIC(50)=0.12 microg ml(-1); MIC(90)=0.25 microg ml(-1)). Only a single isolate was resistant to three or more antimicrobial classes. Ninety-six isolates (5.7%) were susceptible to the complete antimicrobial panel.
Goff
Debra A
DA
The Ohio State University Medical Center, Department of Pharmacy, Columbus, OH 43210, USA.
Dowzicky
Michael J
MJ
Wyeth Pharmaceuticals, Collegeville, PA, USA.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002648:Child; D002675:Child, Preschool; D024901:Drug Resistance, Multiple, Bacterial; D006801:Humans; D007223:Infant; D016106:Methicillin Resistance; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D008911:Minocycline / Q000031:analogs & derivatives* / Q000494:pharmacology; D015995:Prevalence; D013203:Staphylococcal Infections / Q000453:epidemiology* / Q000382:microbiology*; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000302:isolation & purification*; D000078304:Tigecycline; D014481:United States / Q000453:epidemiology
D000900:Anti-Bacterial Agents; D000078304:Tigecycline; D008911:Minocycline