Characterisation and in vivo behaviour of a Salmonella typhimurium aroA strain expressing Escherichia coli K1 polysaccharide

David O'Callaghan, Duncan Maskell, Julian E. Beesley, M. Robert Lifely, Ian Roberts, Graham Boulnois, Gordon Dougan

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)


Plasmid pKT274 encoding a determinant for the Escherichia coli K1 polysaccharide was introduced into the Salmonella typhimurium aroA vaccine strain SL3261 and cells harbouring the plasmid were shown to express K1 polysaccharide at their cell surface. SL3261 (pKT274) could be detected in the livers and spleens of BALB/c mice infected by the intravenous route and viable organisms persisted for several weeks. SL3261 (pKT274) was cleared from the livers more rapidly and from the spleens more slowly than SL3261. Unlike mice infected with SL3261 those infected with SL3261 (pKT274) did not exhibit gross splenomegaly during the first three weeks after infection. Mice vaccinated with viable SL3261 (pKT274) were protected against challenge with virulent S. typhimurium but failed to produce detectable levels of humoral anti-K1 polysaccharide antibodies.

Original languageEnglish
Pages (from-to)269-274
Number of pages6
JournalFEMS Microbiology Letters
Issue number3
Publication statusPublished - 1 Jan 1988
Externally publishedYes


  • (Escherichia coli)
  • (Mouse)
  • Infection
  • K1 polysaccharide
  • Polysaccharide synthesis
  • Salmonella typhimurium
  • Vaccination

Cite this