Evaluation of tigecycline activity in clinical isolates among Indian medical centers
Abstract
BACKGROUND: Resistance to multiple antibiotics among Gram-positive cocci (GPC) and Gram negative bacilli (GNB) is high in India. Tigecycline, a glycylcycline antibiotic is a newer treatment option for emerging single or multidrug-resistant (MDR) GPC and GNB.
MATERIAL AND METHOD: We evaluated the in vitro activity of tigecycline and compared it against other antimicrobials. Between 2005-2007, seven Indian medical centers from diverse geographic regions forwarded 727 isolates [Escherichia coli (166), Staphylococcus aureus (125), Klebsiella spp (120), Streptococcus pneumoniae (102), Enterococcus spp. (100), Pseudomonas aeruginosa (50), Acinetobacter spp. (50) and Enterobacter spp. (14)] from patients with blood stream (BSI), skin and soft tissue (SSTI) including surgical site, urinary tract and respiratory infections to our reference laboratory. Susceptibility to 11 antimicrobials besides tigecycline included: vancomycin, linezolid, teicoplanin, quinopristin-dalfopristin, daptomycin, amikacin, imipenem, levofloxacin, meropenem, and piperacillin/tazobactam was determined by agar dilution and Etest method.
RESULT: Tigecycline was active against all GPC (MIC 90 < 0.25 μg/ml), E. coli and Klebsiella spp. (MIC 90 ≤1 μg/ml). MDR Acinetobacter spp. showed lower susceptibility (70.6%) to tigecycline. Tigecycline MIC 90 values were not influenced by oxacillin resistance among S. aureus, S. pneumoniae, vancomycin resistance in Enterococci (VRE) and ESBL producing E. coli, Klebsiella spp.…
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