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In vitro activity of gentamicin, amikacin and netilmicin alone and in combination with carbenicillin against Serratia marcescens. 1976

S M Pogwizd, and S A Lerner

The inhibitory and bactericidal effects of gentamicin, amikacin, netilmicin (Sch 20569), and carbenicillin were tested against 55 clinical isolates of Serratia marcescens that had been subtyped into 26 strains by biotyping and serotyping. Three major patterns of resistance to gentamicin, netilmicin, and carbenicillin were recognized among these isolates. (i) Most of the 27 isolates that were susceptible to gentamicin (minimal bactericidal concentration [MBC] </=6.25 mug/ml) were susceptible to carbenicillin (MBC </=125 mug/ml) and resistant to netilmicin (MBC >/=12.5 mug/ml). (ii) Most of the 11 isolates with moderate resistance to gentamicin (MBC of 12.5 to 25 mug/ml) were also susceptible to carbenicillin and resistant to netilmicin. (iii) The 17 isolates with high-level resistance to gentamicin (MBC >/= 50 mug/ml) were all highly resistant to carbenicillin (MBC >/=8,000 mug/ml) but susceptible to netilmicin (MBC </=6.25 mug/ml). The susceptibility to amikacin was unpredictable among these groups of isolates but, overall, 80% of the isolates were killed by 25 mug of amikacin/ml, which is within the range of peak serum concentrations used therapeutically. Clinically attainable subinhibitory concentrations of carbenicillin enhanced the activity of the three aminoglycosides against all isolates with MBCs of carbenicillin </=2,000 mug/ml. The 17 isolates with high-level resistance to carbenicillin and gentamicin, as well as the four isolates with high-level resistance to carbenicillin but not to gentamicin, were not susceptible to such enhancement of aminoglycoside activity by carbenicillin.

UI MeSH Term Description Entries
D007612 Kanamycin Antibiotic complex produced by Streptomyces kanamyceticus from Japanese soil. Comprises 3 components: kanamycin A, the major component, and kanamycins B and C, the minor components. Kanamycin A,Kanamycin Sulfate,Kantrex
D002228 Carbenicillin Broad-spectrum semisynthetic penicillin derivative used parenterally. It is susceptible to gastric juice and penicillinase and may damage platelet function. Carboxybenzyl Penicillin,Anabactyl,Carbapen,Carbecin,Carbenicillin Disodium,Geopen,Microcillin,Pyopen,Disodium, Carbenicillin,Penicillin, Carboxybenzyl
D004357 Drug Synergism The action of a drug in promoting or enhancing the effectiveness of another drug. Drug Potentiation,Drug Augmentation,Augmentation, Drug,Augmentations, Drug,Drug Augmentations,Drug Potentiations,Drug Synergisms,Potentiation, Drug,Potentiations, Drug,Synergism, Drug,Synergisms, Drug
D005839 Gentamicins A complex of closely related aminoglycosides obtained from MICROMONOSPORA purpurea and related species. They are broad-spectrum antibiotics, but may cause ear and kidney damage. They act to inhibit PROTEIN BIOSYNTHESIS. Gentamicin Sulfate (USP),Gentamycin,G-Myticin,Garamycin,Gentacycol,Gentamicin,Gentamicin Sulfate,Gentamycins,Gentavet,Genticin,G Myticin,GMyticin,Sulfate, Gentamicin
D000583 Amikacin A broad-spectrum antibiotic derived from KANAMYCIN. It is reno- and oto-toxic like the other aminoglycoside antibiotics. A.M.K,Amikacin Sulfate,Amikacina Medical,Amikacina Normon,Amikafur,Amikalem,Amikason's,Amikayect,Amikin,Amiklin,Amukin,BB-K 8,BB-K8,Biclin,Biklin,Gamikal,Kanbine,Oprad,Yectamid,BB K 8,BB K8,BBK 8,BBK8,Medical, Amikacina,Normon, Amikacina,Sulfate, Amikacin
D000900 Anti-Bacterial Agents Substances that inhibit the growth or reproduction of BACTERIA. Anti-Bacterial Agent,Anti-Bacterial Compound,Anti-Mycobacterial Agent,Antibacterial Agent,Antibiotics,Antimycobacterial Agent,Bacteriocidal Agent,Bacteriocide,Anti-Bacterial Compounds,Anti-Mycobacterial Agents,Antibacterial Agents,Antibiotic,Antimycobacterial Agents,Bacteriocidal Agents,Bacteriocides,Agent, Anti-Bacterial,Agent, Anti-Mycobacterial,Agent, Antibacterial,Agent, Antimycobacterial,Agent, Bacteriocidal,Agents, Anti-Bacterial,Agents, Anti-Mycobacterial,Agents, Antibacterial,Agents, Antimycobacterial,Agents, Bacteriocidal,Anti Bacterial Agent,Anti Bacterial Agents,Anti Bacterial Compound,Anti Bacterial Compounds,Anti Mycobacterial Agent,Anti Mycobacterial Agents,Compound, Anti-Bacterial,Compounds, Anti-Bacterial
D012706 Serratia marcescens A species of gram-negative, facultatively anaerobic, rod-shaped bacteria found in soil, water, food, and clinical specimens. It is a prominent opportunistic pathogen for hospitalized patients.
D012853 Sisomicin Antibiotic produced by Micromonospora inyoensis. It is closely related to gentamicin C1A, one of the components of the gentamicin complex (GENTAMICINS). Sisomycin,Sissomicin,4,5-Dehydrogentamicin,Antibiotic 6640,Extramycin,Pathomycin,Rickamicin,Sch-13475,Siseptin,Sisomicin Sulfate,Sisomicin Sulfate (2:5) Salt,Sizomycin,4,5 Dehydrogentamicin,Sch 13475,Sch13475

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