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Research Article Free access | 10.1172/JCI109741

Phenotypic and Genetic Variation in the Susceptibility of Haemophilus influenzae Type b to Antibodies to Somatic Antigens

Porter Anderson, Alan Flesher, Stephen Shaw, A. Lynn Harding, and David H. Smith

Department of Pediatrics, University of Rochester Medical Center, Rochester, New York 14642

Find articles by Anderson, P. in: JCI | PubMed | Google Scholar

Department of Pediatrics, University of Rochester Medical Center, Rochester, New York 14642

Find articles by Flesher, A. in: JCI | PubMed | Google Scholar

Department of Pediatrics, University of Rochester Medical Center, Rochester, New York 14642

Find articles by Shaw, S. in: JCI | PubMed | Google Scholar

Department of Pediatrics, University of Rochester Medical Center, Rochester, New York 14642

Find articles by Harding, A. in: JCI | PubMed | Google Scholar

Department of Pediatrics, University of Rochester Medical Center, Rochester, New York 14642

Find articles by Smith, D. in: JCI | PubMed | Google Scholar

Published April 1, 1980 - More info

Published in Volume 65, Issue 4 on April 1, 1980
J Clin Invest. 1980;65(4):885–891. https://doi.org/10.1172/JCI109741.
© 1980 The American Society for Clinical Investigation
Published April 1, 1980 - Version history
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Abstract

Haemophilus influenzae type b (H.i.b) has been investigated with respect to phenotypic and genetic variations resulting in differential susceptibility to bactericidal antibody. Previous studies had shown that after growth in infected rats or in dialysate of rat serum, H.i.b strain Eag became more resistant to the bactericidal activity of antisomatic antibody. We now report that a similar phenotypic shift occurs when strain Eag is incubated with dialysate of human serum, that the increased resistance is to antibodies against determinants in the lipopolysaccharide not for the somatic antigens generally, and that most strains of H.i.b undergo the shift.

To assess genetic differences in exposed antigens, a panel of 13 H.i.b isolates from cerebrospinal fluid were analyzed with cross-adsorbed antisera. Seven different patterns were found that could be accounted for through the variable expression of six antigens. These ranged from infrequent (found on 1:13 strains) to common (10:13 strains). At least four were somatic rather than capsular determinants; the most common (antigen 1) was contained in lipopolysaccharide.

The epidemiologic relevance of the genetic variations was explored using pairs of isolates from two children who had had two documented infections with H.i.b. In both cases the isolates varied in somatic antigen expression. The strains from one patient differed in the expression of antigen 1. The isolates from the other were indistinguishable in sub-typing for the six classified antigens, but differed in the expression of an additional antigen identified by use of the patient's serum.

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