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Mucosal vaccination against pneumococcal disease offers potential protection against otitis media, pneumonia and invasive disease, including providing herd benefit by reducing pathogen carriage. The major obstacle, however, remains the lack of a suitable adjuvant for use in humans. Animal models have demonstrated success of interleukin-12 (IL-12) as an adjuvant for mucosal vaccines using recombinant...
Asplenic individuals have increased susceptibility to septicemia caused by encapsulated bacteria. Streptococcus pneumoniae, a pathogen carried in the nasal passages of many humans without complication, is responsible for a large proportion of infections seen in asplenic individuals. Our studies have evaluated the efficacy of antibodies to pneumococcal surface protein A (PspA) in protection of asplenic...
Widespread use of conjugate vaccines against Streptococcus pneumoniae, by reducing carriage of S. pneumoniae serotypes included in the vaccine, may result in an increase in nasopharyngeal carriage of - and disease from - nonvaccine serotypes of the same species. Mathematical models predict that the extent of such replacement will depend positively on the degree to which carriage of vaccine-type S...
All Streptococcus pneumoniae isolates tested to date express a species-common lipoprotein designated as pneumococcal surface adhesin A (PsaA). This protein is cell-associated, hydrophobic, immunogenic, and genetically conserved. It is currently under investigation as a potential component in third-generation pneumococcal vaccine formulations. To overcome the problem of low-level expression of native...
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