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  • Non-vaccine Streptococcus pneumoniae serotypes are increasingly associated with disease. We evaluated isolates of the same sequence type (ST199) but different serotype (15B/C, 19A) for growth in vitro, and pathogenic potential in a chinchilla otitis media model. We also developed a qPCR assay to quantitatively assess each isolate, circumventing the need for selectable markers. In vitro studies showed faster growth of serotype 19A over 15B/C. Both were equally capable of colonization and middle ear infection in this model. Serotype 19A is included in new conjugate vaccine formulations while serotype 15B/C is not. Non-capsular vaccine targets will be important in disease prevention efforts.
subject
  • Virology
  • Microbiology
  • Serology
  • Immune system
  • Titration
  • Speciation
  • Biological classification
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