Severe pancytopenia triggered by recombinant hepatitis B vaccine
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Severe pancytopenia triggered by recombinant hepatitis B vaccine
Clinique de Medecine Interne et Maladies Infectieuses, Service d'Hematologie,
Laboratoire d'Anatomopathologie, Hopital Haut-Leveque, Pessac, France.
JF.viallard@umr5540.u-bordeaux2.fr
We describe the case of a teenager who developed fever, arthritis, cutaneous
vasculitis and severe pancytopenia 3 weeks after the third vaccination boost
with a recombinant hepatitis B vaccine. Bone marrow examination showed paucity
of late myeloid elements and, subsequently, maturation arrest. Interferon-gamma
(IFN-gamma) production by peripheral blood mononuclear cells from the patient
was dramatically increased. An underlying immune predisposition (HLA-DR3) may
have indirectly enabled the vaccine to trigger a hepatitis B virus-specific
cytotoxic T-lymphocyte response. It is therefore possible that the pancytopenia
was induced by a dysregulation of the CD8+ T-cell compartment via increased
IFN-gamma production.
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