Hepatitis A vaccine associated with autoimmune hepatitis

Area of Science:

• Hepatology
• Immunology
• Vaccinology

Background:

• Autoimmune hepatitis (AIH) is a chronic liver disease characterized by immune-mediated liver damage.
• Hepatotropic viruses, including hepatitis A virus (HAV), have been implicated as potential triggers for AIH.
• Vaccination strategies aim to prevent viral infections but can rarely elicit off-target immune responses.

Observation:

• A case report details a patient who developed severe liver injury shortly after receiving a formalin-inactivated hepatitis A vaccine.
• The patient had recently recovered from an uncharacterized, self-limiting liver illness.
• Clinical presentation included elevated liver enzymes (AST 1687 U/L) and coagulopathy (INR 1.4).

Findings:

• The patient tested positive for anti-nuclear antibodies.
• Liver biopsy results were consistent with autoimmune hepatitis.
• These findings suggest a probable link between hepatitis A vaccination and the onset of AIH.

Implications:

• This case supports the hypothesis that hepatitis A virus (HAV) infection or vaccination can act as a trigger for autoimmune hepatitis.
• The study reviews literature on T-cell activity and antibody responses in HAV infection, exploring molecular mimicry as a mechanism for viral hepatitis-associated autoimmunity.
• Further investigation into the immunological mechanisms underlying vaccine-associated autoimmunity is warranted.