In vitro susceptibility of Campylobacter pyloridis to cimetidine, sucralfate, bismuth and sixteen antibiotics.

The in vitro susceptibility of recent Danish human clinical isolates of Campylobacter pyloridis to cimetidine, sucralfate, bismuth subsalicylate and sixteen antimicrobial agents was determined by an agar-dilution technique. Benzylpenicillin was the most active drug (MIC90 = 0.1 microgram/ml); ampicillin, erythromycin, gentamicin and ciprofloxacin were slightly less active. All strains were resistant to 100 micrograms sulfamethizole, and nalidixic acid also had little activity on weight basis. Of the three anti-peptic ulcer drugs, bismuth subsalicylate was most active (MIC90 25 micrograms/ml), but sucralfate and cimetidine also had antibacterial activity, although only little (MIC90 3200 micrograms/ml).