Typing of urogenital, maternal, and neonatal isolates of Haemophilus influenzae and Haemophilus parainfluenzae in correlation with clinical source of isolation and evidence for a genital specificity of H. influenzae biotype IV
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Discussion
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Implication
Observational study reveals distinct biotypic and membrane protein traits of Haemophilus strains in urogenital and neonatal infections, indicating genital adaptation of biotype IV.
Key Points
- To characterize urogenital, maternal, and neonatal isolates of Haemophilus influenzae and Haemophilus parainfluenzae to identify correlations with clinical manifestations and evaluate potential genital tropism.
- Evaluated 114 clinical strains of H. influenzae and H. parainfluenzae recovered over a 6-year period from genital, mother-infant, or neonatal infections.
- Profiled isolates by determining serotypes, biotypes, antibiotic susceptibility, and outer membrane protein (OMP) electrophoretic signatures, comparing them against reference genital strains.
- H. influenzae was more commonly associated with severe genital infections than H. parainfluenzae, with 62% of endometritis or pelvic inflammatory disease cases linked to intrauterine device presence.
- Nontypeable and biotype II strains predominated overall, whereas biotype I was most frequent in pelvic inflammatory disease and biotype IV represented 25% of mother-infant isolates.
- Biotype IV isolates demonstrated specific genital tract adaptations, characterized by peritrichous fimbriation and a uniform OMP pattern featuring a unique protein of approximately 18,000 molecular weight.
Cite This Study
Quentin et al. (1989) studied this question.