Antibiotic Susceptibility of Invasive Haemophilus influenzae Strains in Canada▿

摘要

Canadian invasive Haemophilus influenzae isolates from 1990 to 2006 were examined for antibiotic susceptibility: 42 strains (17.8%) were resistant to ampicillin by β-lactamase production, 5.5% were β-lactamase negative ampicillin intermediate, and 2.5% were intermediate to only the 2-μg ampicillin disk. An increase in β-lactamase-negative ampicillin-intermediate strains has been found.