Journal
LANCET INFECTIOUS DISEASES
Volume 14, Issue 1, Pages 70-82Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S1473-3099(13)70170-1
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- Wellcome Trust
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Haemophilus influenzae, particularly H influenzae serotype b (Hib), is an important pathogen that causes serious diseases like meningitis and septicaemia. Since the introduction of Hib conjugate vaccines in the 1990s, the epidemiology of invasive H influenzae disease has changed substantially, with most infections now caused by non-Hib strains. We discuss the importance of H influenzae serotype a (Hia) as a cause of serious morbidity and mortality and its global epidemiology, dinical presentation, microbiology, immunology, prevention, and control. Much like Hib, the capsule of Hia is an important virulence factor contributing to the development of invasive disease. Molecular typing of Hia has identified distinct clonal groups, with some linked to severe disease and high case-fatality rates. Similarities between Hia and Hib capsules, their clinical presentation, and immunology of infection suggest that a bivalent Hia Hib capsular polysaccharide-protein conjugate vaccine could offer protection against these two important serotypes of H influenzae.
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