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. 1991 Oct;59(10):3366–3371. doi: 10.1128/iai.59.10.3366-3371.1991

Surface structures and adherence properties of diverse strains of Haemophilus influenzae biogroup aegyptius.

J W St Geme 3rd 1, J R Gilsdorf 1, S Falkow 1
PMCID: PMC258892  PMID: 1680103

Abstract

Haemophilus influenzae biogroup aegyptius is an important cause of conjunctivitis and has recently been associated with Brazilian purpuric fever (BPF), a fulminant systemic disease of children. To gain insight into the bacterial factors involved in the pathogenesis of this disease, we investigated the surface structures and adherence properties of eight different strains of H. influenzae biogroup aegyptius, including both BPF and non-BPF isolates. All eight strains were able to express long peritrichous pili similar to those observed in H. influenzae. As in H. influenzae, piliation correlated with colony binding of human erythrocytes. However, two strains were capable of hemagglutination in the absence of pili; in these strains, hemagglutination was insensitive to protease treatment, suggesting a nonproteinaceous hemagglutinin. All strains possessed short, thin, surface fibers distinct from long pili and demonstrated efficient attachment to cultured human conjunctival cells. Attachment to conjunctival cells occurred independently of long pili or a capacity for hemagglutination.

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Selected References

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