Inactivated pep27 mutant as an effective mucosal vaccine against a secondary lethal pneumococcal challenge in mice.

Academic Article


  • PURPOSE: A pep27 mutant may be able to elicit mucosal immunity against pneumococcal diseases, and could be employed as an inexpensive attenuated vaccine. However, this particular mutant contains an erythromycin-resistance marker. The purpose of the current study is to develop a markerless pep27 mutant and assess whether this inactivated mutant is able to induce mucosal immunity. MATERIALS AND METHODS: Mice were vaccinated intranasally with the inactivated markerless pep27 mutant every 2 weeks for a total of three times, after which time serum samples were analyzed for antibody titers. The mice were then challenged with a lethal D39 strain and their survival time was measured. The cross-reactivity of the antisera against pep27 was also compared to other mutant serotypes. RESULTS: Intranasal immunization of mice with the inactivated markerless pep27 mutant provides effective protection and rapidly cleared bacterial colonization in vivo. Moreover, antisera raised against the pep27 mutant may cross-react with several other serotype strains. CONCLUSION: Intranasal immunization with the inactivated pep27 mutant may be able to provide mucosal immunity, and could represent an efficient mucosal vaccine.
  • Authors


  • Inactivated vaccine, Mucosal immunity, No antibiotic resistance marker, Streptococcus pneumoniae, pep27 mutant
  • Digital Object Identifier (doi)

    Author List

  • Choi S-Y; Tran TD-H; Briles DE; Rhee D-K
  • Start Page

  • 58
  • End Page

  • 65
  • Volume

  • 2
  • Issue

  • 1