Antibiotic susceptibility of Kingella kingae isolates from respiratory carriers and patients with invasive infections

The antimicrobial drug susceptibilities of 145 isolates of Kingella kingae to eight antibiotics were determined by the disc diffusion method. In addit ion, penicillin MICs were determined by the Etest. Study isolates included 37 from blood, 34 from the skeletal system and 74 from respiratory carriers . All isolates were beta -lactamase negative and susceptible to erythromyci n, gentamicin, chloramphenicol, tetracycline and ciprofloxacin. A single is olate exhibited resistance to trimethoprim-sulphamethoxazole, and 56 (38.6% ) were resistant to clindamycin. The penicillin MI50 was 0.023 mg/L and the MIC90 was 0.047 mg/L. The distribution of MIC values did not differ accord ing to the site of isolation.