Overlap syndrome triggered by acute viral hepatitis A

Area of Science:

• Hepatology
• Immunology
• Virology

Background:

• Autoimmune hepatitis (AIH) can be triggered by viral infections in genetically susceptible individuals.
• Hepatitis A virus (HAV) infection has been linked to type 1 AIH in a limited number of published cases.
• Overlap syndromes, combining features of different autoimmune liver diseases, present diagnostic and therapeutic challenges.

Observation:

• A 24-year-old woman presented with symptoms suggestive of an autoimmune liver condition.
• Acute hepatitis A was diagnosed, followed by the development of features consistent with both autoimmune hepatitis and primary biliary cirrhosis.
• This clinical presentation represents an autoimmune hepatitis/primary biliary cirrhosis overlap syndrome.

Findings:

• The patient's autoimmune hepatitis/primary biliary cirrhosis overlap syndrome was found to be triggered by an acute hepatitis A infection.
• This represents the first reported case of an overlap syndrome of autoimmune hepatitis and primary biliary cirrhosis initiated by hepatitis A virus.
• While HAV has been implicated in type 1 AIH, its role in triggering overlap syndromes is previously undocumented.

Implications:

• This case expands the understanding of viral triggers for autoimmune liver diseases, particularly overlap syndromes.
• It suggests that hepatitis A virus may play a role in the pathogenesis of complex autoimmune liver conditions beyond type 1 AIH.
• Further research is warranted to explore the mechanisms by which viral infections can precipitate autoimmune liver disease and overlap syndromes.