Meropenem tb

Rins third- and fourth-generation cephalosporins: cefotaxime, ceftriaxone, ceftazidime, cefepime, and cefpirome ; , carbapenems imipenem and meropenem ; , ciprofloxacin parenteral form ; , and glycopeptides vancomycin and teicoplanin ; expressed as defined daily dose per 1, 000 patient-days from 1991 to 2001 was also analyzed. All of these drugs were introduced into the hospital before 1991, except for cefepime, which became available only in 1997; meropenem, available since 1998 only; and cefpirome, available since 2000. From January 1999 to June 2002, all of the isolates of MRSA recovered from various specimens from the patients treated at the NTUH were routinely subjected to screening for their susceptibility to vancomycin by a method described previously 10 ; . Briefly, overnight cultures of MRSA isolates were adjusted to 0.5 U of McFarland turbidity and 10 l of the cell suspension was inoculated onto a brain-heart infusion agar BBL Microbiology Systems, Cockeysville, Md. ; plate containing 4 g of vancomycin Eli Lilly & Co., Indianapolis, Ind. ; ml. The plate contents were incubated at 37C for 48 h. If confluent growth was seen within 24 h, the isolate was considered possibly vancomycin-resistant S. aureus or VISA. If a countable number of colonies were found within 48 h, the isolate was considered possibly hetero-VISA 10 ; . A total of 300 consecutive and nonduplicate blood isolates of S. aureus, including 200 isolates of MRSA and 100 of oxacillin methicillin ; -susceptible S. aureus MSSA ; , from 300 patients who had bloodstream infections and who were treated at the NTUH from January 2000 to July 2002, were collected for this study. An additional 100 isolates of MRSA were also collected from 30 patients with MRSA bacteremia infective endocarditis, osteomyelitis, and center venous catheter-related sepsis ; and who failed glycopeptide therapy persistent fever and breakthrough MRSA bacteremia ; . These patients were seen at the hospital between January 2001 and June 2002. Each patient had two to four MRSA isolates, with intervals of 7 to days, recovered from blood specimens. The isolates were stored at 70C in Trypticase soy broth Difco Laboratories, Detroit, Mich. ; supplemented with 15% glycerol before being tested.
This work describes the discovery and characterization of a novel series of tricyclic natural product-derived metallo lactamase inhibitors. Natural product screening of the Bacillus cereus II enzyme identified an extract from a strain of Chaetomium funicola with inhibitory activity against metallo lactamases. SB236050, SB238569, and SB236049 were successfully extracted and purified from this extract. The most active of these compounds was SB238569, which possessed Ki values of 79, 17, and 3.4 M for the Bacillus cereus II, Pseudomonas aeruginosa IMP-1, and Bacteroides fragilis CfiA metallo lactamases, respectively, yet none of the compounds exhibited any inhibitory activity against the Stenotrophomonas maltophilia L-1 metallo lactamase 50% inhibitory concentration 1, 000 M ; . The lack of activity against angiotensin-converting enzyme and serine -lactamases demonstrated the selective nature of these compounds. The crystal structure of SB236050 complexed in the active site of CfiA has been obtained to a resolution of 2.5 . SB236050 exhibits key polar interactions with Lys184, Asn193, and His162 and a stacking interaction with the indole ring of Trp49 in the flap, which is in the closed conformation over the active site groove. SB236050 and SB238569 also demonstrate good antibacterial synergy with meropenem. Eight micrograms of SB236050 per ml gave rise to an eightfold drop in the MIC of meropenem for two clinical isolates of B. fragilis producing CfiA, making these strains sensitive to meropenem MIC 4 g ml ; Consequently, this series of metallo lactamase inhibitors exhibit the most promising antibacterial synergy activity so far observed against organisms producing metallo lactamases. Metallo lactamases provide bacteria with an efficient and effective way of mediating resistance to -lactam-based antibacterial agents. More significantly, they confer resistance to carbapenems. Therefore, if metallo lactamases increase in prevalence, they could compromise the efficacy of this group of antibiotics to treat life-threatening hospital infections. Metallo lactamases have now been identified in a wide spectrum of clinically important pathogens, such as Klebsiella pneumoniae, Pseudomonas aeruginosa, Serratia marcescens, and Acinetobacter sp. 21; H. Ito, K. Senda, T. Yagi, K. Shibayama, M. Ohta, N. Kato, and Y. Arakawa, Abstr. 37th Intersci. Conf. Antimicrob. Agents Chemother., abstr. C-93, 1997 ; . These enzymes also possess a proven capability to disseminate through bacterial populations, which is demonstrated by the spread of the IMP-1 metallo lactamase in Japan reviewed in reference 17 ; . The spread of this enzyme is thought to be facilitated by its being encoded on an integron 1 ; . More recently, clinical isolates producing metallo lactamases have been identified in Europe 5, 12, 24 ; . One approach to combating this potential clinical problem is the use of a specific metallo lactamase inhibitor in combina * Corresponding author. Mailing address: Anti-Infectives Research UP1345, SmithKline Beecham Pharmaceuticals, 1250 South Collegeville Rd., Collegeville, PA 19426-0989. Phone: 610 ; 917-7355. Fax: 610 ; 917-7901. E-mail: David J Payne sbphrd . 1880.

Do you know your sexual limits? Can you talk openly with your partner about sex? Such questions as these will be addressed through fun activities and discussions. Learn the tools needed for open communication and evaluate your feelings about sex and mesna. Merrem meropenem meropenem drug interactions compare meropenem with other medications for the treatment of: skin or soft tissue infection , skin and deeper structure infection , meningitis , intraabdominal infection , nosocomial pneumonia user reviews: 0 comment s ; about meropenem services a to z drug list drugs by condition drug side effects pill identifier interactions checker news & articles new drug approvals new drug applications fda drug alerts clinical trial results drug image search patient care notes medical encyclopedia medical dictionary medical videos - drug classification community forums for professionals drug imprint codes medical abbreviations veterinary drugs contact us news feeds advertise here recent searches zantac neurontin apidra eloxatin vectibix mircette viagra propecia lipitor xenical ephedrine tiazac seasonique actoplus met imodium cellcept evithrom recently approved pristiq arcalyst xyntha simcor accretropin moxatag tekturna hct intelence recothrom flo-pred more.

Susceptibility to cefepime and aztreonam MICs, 8 g ml for both drugs ; . The MICs of ceftazidime, cefotaxime, ceftriaxone, cefpodoxime, and cefepime did not decrease when they were tested in combination with clavulanic acid, indicating that 810 probably did not contain an extended-spectrum -lactamase. The MICs of cefepime 0.5 g ml ; , meropenem 0.25 g ml ; , and imipenem 1 g ml ; were lower for the revertant 810-REV the revertant was isolated after five passages on nonselective medium ; and approximated those for carbapenem-susceptible E. aerogenes type strain ATCC 13048. Carbapenem resistance is not associated with production of -lactamase. IEF of E. aerogenes parent strain 810 revealed two -lactamases with pIs of 8.2 and 5.4 Fig. 1 ; . Imipenemsusceptible revertant 810-REV also produced two -lactamases with pIs of 8.2 and 5.4 Fig. 1 ; . Overlaying of the IEF gel with 100 g of cloxacillin per ml blocked the hydrolysis of nitrocefin by the -lactamase of pI 8.2 but not the activity of the -lactamase of pI 5.4, indicating that the pI 8.2 enzyme is likely an AmpC enzyme data not shown ; . Amplification of DNA from strain 810 with blaTEM-specific PCR primers, followed by DNA sequence analysis, confirmed that the -lactamase with the pI of 5.4 was TEM-1. In order to determine whether carbapenem resistance could be attributed to production of one of these -lactamases, a disk diffusion inactivation assay was performed Fig. 2 ; . Alterations of the zones of inhibition around cefotaxime, ceftriaxone, and piperacillin disks were observed for strains 810 and 810-REV; however, the zones of inhibition around the imipenem, cefepime, and ceftazidime disks were not affected. This indicates that -lactamase production was not responsible for imipenem resistance in 810. It is unclear why ceftazidime was not more clearly inactivated and mesna.

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