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In vitro activity of a new monobactam, carumonam (RO 17-2301, AMA 1080) was tested against 370 hospital bacterial isolates. Results were compared to aztreonam, cefotaxime, cefmenoxime, latamoxef, ceftazidime, ceftriaxone, pefloxacin against Enterobacteriaceae, to aztreonam, piperacillin, cefoperazone, cefsulodin, ceftazidime, imipenem and pefloxacin against P. aeruginosa. All Enterobacteriaceae strains produced cephalosporinases and all P. aeruginosa strains were ticarcillin resistant. MIC 90% of carumonam against Enterobacteriaceae strains was lower than 0.25 mg/l for P. mirabilis, P. vulgaris, P. stuartii, Salmonella sp., ranged from 0.25 to 0.5 mg/l for Klebsiella sp. and S. marcescens, from 1 to 2 mg/l for E. coli and P. morganii, and from 4 to 8 mg/l for C. freundii and E. cloacae. The rate of strains inhibited with 4 mg/l of carumonam was 95.3%. So carumonam was at the second place from eight tested products, after latamoxef (97.5% of susceptible strains). Carumonam was active against second generation cephalosporins resistant strains when these strains were susceptible or intermediate to cefotaxime. Strains resistant to this compound escaped to its action. Its activity against A. calcoaceticus was weak (22.6% of strains inhibited by 4 mg/l), but was superior to that of cefsulodin against ticarcillin resistant P. aeruginosa strains (54.5 versus 16.1% of susceptible strains). However carumonam was less active against this last species than ceftazidime or imipenem (92.6 and 91% of susceptible strains respectively).


P Le Noc, J Croize, D Le Noc. Comparative antibacterial activity of a new monobactam, carumonam (RO 17-2301, AMA 1080) on hospital bacteria resistant to beta lactams]. Pathologie-biologie. 1987 May;35(5):451-6

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PMID: 3302846

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