The antibacterial component of cefoperazone / sulbactam is cefoperazone Third-generation cephalosporin, which acts on sensitivemicroorganisms during their active reproduction by inhibiting the biosynthesis of the mucopeptide of the cell wall. Sulbactam sodium is a derivative of the main nucleus of penicillin. Sulbactam does not have clinically significant antibacterial activity (except for Neisseriaceae and Acinetobacter). However,that it is an irreversible inhibitor of most of the major beta-lactamases that are produced by microorganisms resistant to beta-lactam antibiotics.
The ability of sulbactam to prevent the destruction of penicillins and cephalosporins by resistant microorganisms was confirmed in studies using resistant strains for which sulbactam possessed a pronounced synergy with penicillins and cephalosporins. In addition, sulbactam interacts with some penicillin-binding proteins, so cefoperazone / sulbactam often has a more pronounced effect on sensitive strains than one cefoperazone.
The combination of sulbactam and cefoperazone is active against all microorganisms sensitive to cefoperazone. In addition, it has a synergistic effect on various microorganisms, primarily: Haemophilus influenzae, Bacleroicles spp., Staphylococcus spp., Acinetobacter calcoaceticus, Enterobacter aerogenes, Escherichia coli, Proteus mirabilis, Klebsiella pneumoniae, Morganella morganii, Citrobacter freundii, Enterobacter cloacae. Citrobacter diversus.
Cefoperazone / sulbactam is active in vitro for a wide range of clinically relevant microorganisms.
Gram-positive microorganisms
Staphylococcus aureus (producing and not producing penicillinase), Staphylococcus epidermidis. Streptococcus pneumoniae. Streptococcus pyogenes (beta-hemolytic group streptococcus A), Streptococcus agalactiac (beta-hemolytic streptococcus group B), most other strains of beta-hemolytic streptococci, many strains Streptococcus faecalis (enterococci).
Gram-negative microorganisms
Escherichia coli. Klebsiella spp. (at Tom number of Klebsiella pneumonia). Enterobacter spp. ( at Tom number of Enterobacter aerogenes and Enterobacter cloacae). Citrobacter spp. (including Citrobacter freundii and Citrobacter diversus), Haemophilus influenzae. Proteus mirabilis. Proteus vulgaris, Morganella morganii, Providencia rettgeri, Providencia spp., Serratia spp. (including Serratia marcescens), Salmonella and Shigella spp., Pseudomonas aeruginosa and some others Pseudomonas spp., Acinetobacler calcoaceticus, Neisseria gonorrhoeae, Neisseria meningitidis, Bordetellapertussis. Yersinia enlerocolitica.
Anaerobese microorganisms
Gram-negative sticks (including Bacteroides fragilis, others Bacteroides species and Fusobacterium spp.).
Gram-positive and gram-negative cocci (including Peptococcus, Peptostreptococcus and Veillonella spp. ).
Gram-positive sticks (including Clostridium spp., Eubacterium spp. and Lactobacillus spp.).
The following sensitivity levels were established for cefoperazone / sulbactam. The minimum inhibitory concentration (MIC) in mct / ml Expressed in the concentration of cefoperazone for sensitive microorganisms is less than or equal to 16, for organisms with intermediate sensitivity is in the range of 17-63, and for resistant ones, more than 64. Sensitivity zones when determined by a disk diffusion method are : for sensitive microorganisms more than 1 mm; with an intermediate sensitivity of 16 to 20 mm, and for resistance - more than 15 mm.
For the determination of BMD, a serial dilution method of sulbactam / cefoperazone can be used in a ratio of 1: 1 in broth or agar media.
To determine the MPC by disc-diffusion method, it is recommended to use a disk containing 30 μg of sulbacam and 75 μg of cefoperazone.
The following quality control standards are recommended when using discs containing 30 μg of sulbacam and 75 μg of cefoperazone. For the control strain Acinetobacter spp. (ATCC 43498), the diameter of the zone is 26-32; for Pseudomonas aeruginosa (ATCC 27853) 22-28; for Escherichia coli (ATCC 25922) -27-33; for Staphylococcus aureus (ATCC 25923) - 23-30.