title: Outer membrane protein analysis of ampicillin-resistant isolates of Haemophilus influenzae from Saudi Arabia.
abstract: Haemophilus influenzae isolates characterized in a previously published study from the Kingdom of Saudi Arabia were analysed by outer membrane protein (OMP) profiling. Isolates from patients with confirmed respiratory tract infections were investigated. Antibiotic susceptibility tests in vitro showed 25/129 (19.4%) had various degrees of reduced susceptibility to ampicillin although all were fully susceptible to ceftazidime and ciprofloxacin. OMP profiles of the beta-lactamase mediated ampicillin-resistant and beta-lactamase negative; ampicillin intermediate resistant strains (BLNAI) isolated were investigated. Dendrograms of scanned SDS-PAGE of these strains showed 15 different groupings from the 15 non-typable (NTHi) isolates tested demonstrating a high degree of heterogeneity whereas the 5 Hib isolates demonstrated significantly closer relatedness and were probably clonal. The present study demonstrates the groupings of H. influenzae strains by OMP profile analysis which did not correlate with the beta-lactamase production ability, BLNAI isolates, geographical origin or biotype.
authors.affiliation: Department of Forensic and Biomedical Sciences, University of Lincoln, Lincoln, United Kingdom. rdixon@lincoln.ac.uk
authors.forename: Ronald A
authors.initials: RA
authors.lastname: Dixon
authors.forename: Eyad M
authors.initials: EM
authors.lastname: Abdel-Rahman
mesh_terms: D000667:Ampicillin / Q000008:administration & dosage; D000668:Ampicillin Resistance; D000900:Anti-Bacterial Agents / Q000008:administration & dosage; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis* / Q000235:genetics; D006192:Haemophilus Infections / Q000188:drug therapy / Q000453:epidemiology / Q000382:microbiology*; D006193:Haemophilus influenzae / Q000145:classification / Q000302:isolation & purification* / Q000378:metabolism; D006801:Humans; D008826:Microbial Sensitivity Tests; D012529:Saudi Arabia / Q000453:epidemiology; D012703:Serotyping; D001618:beta-Lactamases / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D001425:Bacterial Outer Membrane Proteins; D000667:Ampicillin; D001618:beta-Lactamases