What is in the 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...
  • Print

Ty21a is an oral vaccine that contains live attenuated S typhi Ty21a strains in an enteric-coated capsule. The vaccine elicits both serum and intestinal antibodies and cell-mediated immune responses.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!