title: Activity of common antibiotics against Branhamella catarrhalis, Haemophilus influenzae, pneumococci, group A streptococci and Staphylococcus aureus in 1983.
abstract: The activity of phenoxymethylpenicillin (PcV), ampicillin, cefaclor, cefuroxime, chloramphenicol, co trimoxazole, doxycycline and erythromycin against clinical isolates of Branhamella catarrhalis, Haemophilus influenzae, pneumococci, group A streptococci and Staphylococcus aureus in 1983 was investigated with the MIC-method (plate-dilution technique). Forty-six percent of B. catarrhalis, 2% of H. influenzae and 78% of S. aureus were beta-lactamase producing and had high MIC-values for penicillin and ampicillin. Thus MIC for 90% of all strains of B. catarrhalis was 32 mg/l and 8 mg/l for penicillin and ampicillin while MIC for 90% of non beta-lactamase producing Branhamella strains was 2 mg/l and 0.25 mg/l respectively. This indicates a high susceptibility of penicillins to the action of Branhamella beta-lactamase. Almost all strains of B. catarrhalis, pneumococci, group A streptococci and S. aureus were inhibited at low concentrations of erythromycin. However, 4 mg/l was required to inhibit 90% of H. influenzae. Co-trimoxazole and doxycycline had good activity against all B. catarrhalis and H. influenzae strains while a few pneumococci, streptococci and staphylococci had intermediate sensitivity or were resistant. Essentially all strains were sensitive to cefuroxime and chloramphenicol.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002433:Cefaclor / Q000494:pharmacology; D002444:Cefuroxime / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004318:Doxycycline / Q000494:pharmacology; D004338:Drug Combinations / Q000494:pharmacology; D004917:Erythromycin / Q000494:pharmacology; D006193:Haemophilus influenzae / Q000187:drug effects*; D006801:Humans; D009343:Neisseria / Q000187:drug effects*; D010403:Penicillin Resistance; D010404:Penicillin V / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects*; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D013297:Streptococcus pyogenes / Q000187:drug effects*; D013420:Sulfamethoxazole / Q000494:pharmacology; D014295:Trimethoprim / Q000494:pharmacology; D015662:Trimethoprim, Sulfamethoxazole Drug Combination
chemical_list: D000900:Anti-Bacterial Agents; D004338:Drug Combinations; D004917:Erythromycin; D002433:Cefaclor; D000667:Ampicillin; D015662:Trimethoprim, Sulfamethoxazole Drug Combination; D014295:Trimethoprim; D013420:Sulfamethoxazole; D004318:Doxycycline; D002444:Cefuroxime; D010404:Penicillin V