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Hepatitis in marmosets.

F Deinhardt, D Peterson, G Cross

    The American Journal of the Medical Sciences
    |July 1, 1975
    PubMed
    Summary
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    Marmosets can contract human hepatitis A virus through oral or parenteral exposure. Infectious virus particles were found in the feces of infected marmosets, highlighting potential transmission routes.

    Area of Science:

    • Virology
    • Hepatology
    • Primatology

    Background:

    • Human hepatitis A virus (HAV) infection is a significant public health concern.
    • Marmosets serve as a valuable animal model for studying HAV pathogenesis and developing vaccines.
    • Previous studies have established marmoset susceptibility to HAV via parenteral inoculation.

    Purpose of the Study:

    • To investigate marmoset susceptibility to human HAV through oral exposure.
    • To characterize the presence and infectivity of HAV in marmoset feces.
    • To compare the antigenic properties of different HAV strains and their implications for vaccine development.

    Main Methods:

    • Marmosets were inoculated with human HAV via parenteral and oral routes.
    • Fecal samples were collected and analyzed for viral antigen and infectious virus particles.

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  • Antigenic characterization of HAV strains (MS-1, CR-326, GB) was performed using immune-adherence assays.
  • Repeated challenge studies were conducted in immune marmosets.

    • Main Results:

    • Marmosets demonstrated susceptibility to HAV through both parenteral and oral exposure.
    • Infectious HAV particles and fecal antigen were detected in the stools of infected marmosets.
    • The MS-1 and CR-326 HAV strains were antigenically similar, while the GB strain differed, potentially linking it to non-A/non-B hepatitis.
    • Repeated HAV challenge in immune marmosets induced hyperergic responses with liver necrosis.

    Conclusions:

    • Oral exposure is a viable route for marmoset HAV infection.
    • Marmoset feces can contain infectious HAV, suggesting fecal-oral transmission potential in this model.
    • Distinct antigenic profiles of HAV strains necessitate strain-specific vaccine considerations.
    • Hyperergic responses in immune animals require careful consideration for HAV vaccine efficacy and safety studies.