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Acute delta hepatitis without circulating HBsAg.

K M De Cock, S Govindarajan, A G Redeker

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    Acute delta hepatitis infection requires coexistent hepatitis B virus infection. A unique case showed delta hepatitis symptoms after hepatitis B virus seroconversion, indicated by specific antibody levels.

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    Area of Science:

    • Hepatology
    • Virology
    • Immunology

    Background:

    • Hepatitis delta virus (HDV) infection, or "delta agent," exclusively occurs with concurrent hepatitis B virus (HBV) infection.
    • HDV is a unique RNA virus that requires HBV for its replication and propagation.

    Observation:

    • A case study details a patient presenting with clinical symptoms of acute delta hepatitis.
    • This occurred during a specific serological window: after the clearance of hepatitis B surface antigen (HBsAg) and the development of antibodies against it.
    • The diagnosis of recent acute HBV infection was confirmed by a high titer of IgM antibody to the hepatitis B core antigen (anti-HBc IgM).

    Findings:

    • The patient exhibited acute delta hepatitis symptoms despite having cleared the hepatitis B surface antigen.
    • The serological profile, characterized by anti-HBs seroconversion and high anti-HBc IgM, alongside acute delta hepatitis, is previously undescribed.
    • This suggests a complex interplay between HBV clearance and HDV superinfection.

    Implications:

    • This case highlights a novel serological presentation of acute delta hepatitis.
    • Understanding this unique profile is crucial for accurate diagnosis and management of HDV infections.
    • Further research is warranted to elucidate the mechanisms behind HDV infection during HBV seroconversion.