In Vitro Sensitivity of Helicobacter pylori
Initial results indicate that long-term eradication of this Helicobacter pylori will be difficult. The first step in the search for a suitable antimicrobial to treat any infection is to determine the in vitro susceptibility of the causative organism to suitable therapeutic agents. The activity of a range of antimicrobial agents against H. pylori was first determined at neutral pH (Table 1) [1, 2]. H. pylori is highly sensitive to most of the β- lactams except cefsulodin. Penicillin, ampicillin, cefuroxime, cefoxitin and cephalexin have minimum inhibitory concentrations for 90% of organisms (MIC 90s) of less than 0.5 mg/litre; flucloxacillin and aztreonam are moderately active with MIC 90s of 2 mg/litre. The macrolides and quinolones except amifloxacin (MIC 90, 4 mg/litre) also have good activity with MIC 90s of less than 0.5 mg/litre. Other agents that have good in vitro activity include nitrofurantoin (MIC 90,0.5 mg/litre), gentamicin (MIC 90,0.25 mg/litre), tetracycline (MIC 90,0.25 mg/litre) and rifampicin (MIC 90,1 mg/ litre). Metronidazole has moderate activity but about 25% of strains are less sensitive . H. pylori is resistant to vancomycin, cefsulodin, trimethoprim and the sulphona- mides.
KeywordsBismuth Ampicillin Vancomycin Tetracycline Erythromycin
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