The Shigella human challenge model

C. K. Porter*, N. Thura, R. T. Ranallo, M. S. Riddle

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

35 Scopus citations


Shigella is an important bacterial cause of infectious diarrhoea globally. The Shigella human challenge model has been used since 1946 for a variety of objectives including understanding disease pathogenesis, human immune responses and allowing for an early assessment of vaccine efficacy. A systematic review of the literature regarding experimental shigellosis in human subjects was conducted. Summative estimates were calculated by strain and dose. While a total of 19 studies evaluating nine strains at doses ranging from 10 to 1 × 1010 colony-forming units were identified, most studies utilized the S. sonnei strain 53G and the S. flexneri strain 2457T. Inoculum solution and pre-inoculation buffering has varied over time although diarrhoea attack rates do not appear to increase above 75-80%, and dysentery rates remain fairly constant, highlighting the need for additional dose-ranging studies. Expansion of the model to include additional strains from different serotypes will elucidate serotype and strain-specific outcome variability.

Original languageEnglish
Pages (from-to)223-232
Number of pages10
JournalEpidemiology and Infection
Issue number2
StatePublished - Feb 2013
Externally publishedYes


  • Gastrointestinal infections
  • Shigella
  • travellers' infection


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