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Between September 1999 and August 2001, we studied serotypes to capsular antigen, beta-lactamase production, mutation of penicillin binding protein (PBP) genes by PCR method, and antimicrobial susceptibilities of 13 strains of Haemophilus influenzae isolated from spinal fluid or blood in children. Diseases of patients were meningitis in 11, pneumonia in 1, and laryngitis in 1. The age range of the patients was from 26 days to 5 years. The serotypes of all strains were b. Four of the 13 strains were beta-lactamase-positive. The mutation of genes of pbp3 was revealed from 4 isolates and 2 of the strains were beta-lactamase-positive. MICs of ampicillin to beta-lactamase-negative strains ranged from 0.125 to 1 microgram/ml and those to beta-lactamase-positive were more than 32 micrograms/ml. MICs of 2 strains of beta-lactamase-negative and mutation-positive were 0.5 and 1 microgram/ml. The excellent active antimicrobials in our study was cefotaxime (MIC90 0.06 microgram/ml), meropenem (MIC90 0.125 microgram/ml), ceftazidime (MIC90 0.25 microgram/ml), and cefepime (MIC90 0.25 microgram/ml).

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Mutation of Penicillin-binding Protein Genes and Antimicrobial Susceptibility of Haemophilus influenzae Isolated from Spinal Fluid or Blood in Children