title: Antibiotic susceptibility of invasive Haemophilus influenzae strains in Canada.
abstract: Canadian invasive Haemophilus influenzae isolates from 1990 to 2006 were examined for antibiotic susceptibility: 42 strains (17.8%) were resistant to ampicillin by beta-lactamase production, 5.5% were beta-lactamase negative ampicillin intermediate, and 2.5% were intermediate to only the 2-microg ampicillin disk. An increase in beta-lactamase-negative ampicillin-intermediate strains has been found.
authors.affiliation: Vaccine Preventable Bacterial Diseases, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Sill
authors.forename: Raymond S W
authors.initials: RS
authors.lastname: Tsang
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D000668:Ampicillin Resistance; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002170:Canada / Q000453:epidemiology; D006192:Haemophilus Infections / Q000382:microbiology; D006193:Haemophilus influenzae / Q000145:classification* / Q000187:drug effects* / Q000201:enzymology; D006801:Humans; D008826:Microbial Sensitivity Tests; D015995:Prevalence; D012703:Serotyping; D001618:beta-Lactamases / Q000096:biosynthesis
chemical_list: D000900:Anti-Bacterial Agents; D000667:Ampicillin; D001618:beta-Lactamases