Hepatitis B virus (HBV) can still be found within the hepatocytes after its clearance and the control of viral replication depends on the immune response. However during immunosuppression, seroconversion of HBsAg has been described followed by disease reactivation. Hepatitis B virus reactivation represents an emerging cause of liver disease in patients undergoing treatment with biologic agents and in particular, by the use of rituximab (anti-CD20) and alemtuzumab (anti-CD52) that cause profound and long-lasting immunosuppression. We describe a case of a 64-year old female patient with rheumatoid arthritis and resolved HBV infection, who experienced a severe hepatitis B reactivation after the administration of rituximab.
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