Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

Three epidemiologically unrelated clusters of Haemophilus influenzae resistant to ampicillin, chloramphenicol, and tetracycline were studied. The biotypes and cell-envelope protein patterns were determined for 17 nonencapsulated strains, 6 from Dundee and 11 from Cheltenham, and for 6 type b encapsulated strains from Guildford. After mobilization by conjugation, large 32- to 36-MDa plasmids were purified from all the strains. The restriction fragment patterns of the plasmids were determined by ethidium bromide staining of digested purified plasmid or by Southern hybridization of digested total cellular DNA of the parent strains, probed with purified plasmid. Evidence is presented for a chromosomal location of the plasmids in the parent strains, the spread in nature of a plasmid between distinguishable strains of H. influenzae, the person-to-person spread of a strain within a cluster, and a high degree of sequence homology between distinguishable plasmids, implying their close relatedness.

Original publication

DOI

10.1093/infdis/165.6.1069

Type

Journal article

Journal

J Infect Dis

Publication Date

06/1992

Volume

165

Pages

1069 - 1075

Keywords

Adult, Ampicillin Resistance, Bacterial Outer Membrane Proteins, Bacterial Typing Techniques, Blotting, Southern, Child, Chloramphenicol Resistance, Cluster Analysis, Conjugation, Genetic, DNA, Bacterial, Female, Haemophilus Infections, Haemophilus influenzae, Humans, Infant, Male, Nucleic Acid Hybridization, Plasmids, Restriction Mapping, Serotyping, Tetracycline Resistance, United Kingdom