What is the efficacy of Ty21a vaccine used in the prevention of typhoid fever (enteric fever)?

Updated: Aug 19, 2019
  • Author: John L Brusch, MD, FACP; Chief Editor: Michael Stuart Bronze, MD  more...
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A systemic review and meta-analysis of 4 randomized controlled trials on the efficacy and safety of Ty21a versus placebo or nontyphoid vaccine found a cumulative efficacy of 51% (95% CI, 36%-62%).

The efficacy of Ty21a has not been studied among persons from areas without endemic disease who travel to disease-endemic regions.

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