title: Phase-variable expression of the 145-kDa surface protein of Brazilian purpuric fever case-clone strains of Haemophilus influenzae biogroup aegyptius.
abstract: Clonally related strains of Haemophilus influenzae biogroup aegyptius have recently been associated with Brazilian purpuric fever (BPF). Antibodies to a 145-kDa minor outer membrane protein (P145) are bactericidal and protect against experimental bacteremia. To determine if P145 is conserved among case-clone strains, case-clone strains were screened for P145 expression. Assays of a large number of colonies of each strain using colony immunoblot revealed colonies reactive with anti-P145 sera in all 17 case-clone strains. P145 was expressed at a low frequency (0.08%-2.2% of colonies) in 14 strains and at a high frequency (> 98%) in 3 strains. Expression of P145 by reactive colonies was confirmed by SDS-PAGE. Also, anti-P145-nonreactive variant colonies of P145-expressing strains were detected in 0.4%-1.5% of colonies. These findings indicate P145 is conserved among BPF case-clone strains and is subject to phase-variable expression.
authors.affiliation: Department of Pediatrics, Schneider Children's Hospital of Long Island Jewish Medical Center, Albert Einstein College of Medicine, New Hyde Park, New York.
authors.forename: L G
authors.initials: LG
authors.lastname: Rubin
mesh_terms: D000818:Animals; D016470:Bacteremia / Q000382:microbiology; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis*; D001938:Brazil; D005334:Fever / Q000382:microbiology; D006193:Haemophilus influenzae / Q000737:chemistry*; D006801:Humans; D008970:Molecular Weight; D051381:Rats
chemical_list: D001425:Bacterial Outer Membrane Proteins