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Related Experiment Videos

Protective immunization against Helicobacter stimulates long-term immunity

F J Radcliff1, M Chen, A Lee

  • 1School of Microbiology and Immunology, University of New South Wales, Sydney, Australia.

Vaccine
|June 1, 1996
PubMed
Summary

Oral immunization with Helicobacter felis antigens and cholera toxin (CT) provides long-lasting protection against H. felis infection in mice. This suggests the vaccine stimulates durable local immunological memory.

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Area of Science:

  • Immunology
  • Microbiology
  • Vaccinology

Background:

  • Helicobacter felis (H. felis) infection can cause gastrointestinal issues.
  • Oral vaccines offer a potential route for immunization against such infections.
  • Cholera toxin (CT) is known to enhance immune responses to co-administered antigens.

Purpose of the Study:

  • To evaluate the duration of protective immunity induced by an oral vaccine against H. felis.
  • To determine if Helicobacter felis sonicate plus cholera toxin (CT) oral immunization elicits long-lived protection.

Main Methods:

  • Mice were immunized orally with whole cell sonicates of H. felis plus CT.
  • Vaccinated mice were challenged with H. felis after a delay of up to 15 months.
  • Protection was assessed by challenging the mice and monitoring for H. felis infection.

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Main Results:

  • All mice immunized with the oral H. felis vaccine remained protected from H. felis challenge even after 15 months.
  • The vaccine demonstrated sustained efficacy in preventing infection over a long period.

Conclusions:

  • Oral immunization with bacterial antigens like H. felis sonicates combined with CT induces robust and long-lasting local immunological memory.
  • This approach holds promise for developing durable vaccines against H. felis and potentially other pathogens.