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Anti-TNF agents are widely used to treat immune-mediated disorders. Reactivation of Hepatitis B virus (HBV) is associated with immunosuppressive agents and biologics such as anti-TNF. There are limited data and differing guidelines for patients with negative hepatitis B surface antigen (HBsAg-) but positive antibody to hepatitis B core antigen (anti-HBc+) on anti-TNF with regards to outcomes and need for anti-viral prophylaxis. We examined the prevalence of HBV reactivation in a single-center retrospective cohort study of 120 HBsAg-, anti-HBc+ patients on anti-TNF, totaling 346.6 patient years. One patient (0.8%) who had a detectable VL (<20 IU) prior to starting anti-TNF had reactivation of HBV with sero-conversion to positive HBsAg. Three patients (2.5%) had undetectable HBV VL prior to anti-TNF and developed detectable VL while on anti-TNF. In conclusion, there was a low rate of HBV reactivation or development of detectable HBV DNA in HBsAg-, anti-HBc+ patients on anti-TNF.
This article was published in the following journal.
Name: Clinical immunology (Orlando, Fla.)
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A measure of the binding strength between antibody and a simple hapten or antigen determinant. It depends on the closeness of stereochemical fit between antibody combining sites and antigen determinants, on the size of the area of contact between them, and on the distribution of charged and hydrophobic groups. It includes the concept of "avidity," which refers to the strength of the antigen-antibody bond after formation of reversible complexes.
The complex formed by the binding of antigen and antibody molecules. The deposition of large antigen-antibody complexes leading to tissue damage causes IMMUNE COMPLEX DISEASES.
Serologic tests based on inactivation of complement by the antigen-antibody complex (stage 1). Binding of free complement can be visualized by addition of a second antigen-antibody system such as red cells and appropriate red cell antibody (hemolysin) requiring complement for its completion (stage 2). Failure of the red cells to lyse indicates that a specific antigen-antibody reaction has taken place in stage 1. If red cells lyse, free complement is present indicating no antigen-antibody reaction occurred in stage 1.
A form of fluorescent antibody technique commonly used to detect serum antibodies and immune complexes in tissues and microorganisms in specimens from patients with infectious diseases. The technique involves formation of an antigen-antibody complex which is labeled with fluorescein-conjugated anti-immunoglobulin antibody. (From Bennington, Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984)
Test for tissue antigen using either a direct method, by conjugation of antibody with fluorescent dye (FLUORESCENT ANTIBODY TECHNIQUE, DIRECT) or an indirect method, by formation of antigen-antibody complex which is then labeled with fluorescein-conjugated anti-immunoglobulin antibody (FLUORESCENT ANTIBODY TECHNIQUE, INDIRECT). The tissue is then examined by fluorescence microscopy.
An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (such as bacteria, fungi, parasites, and viruses) and chemicals. Antibodies may be produc...
Cytokine Tumour Necrosis Factor (TNF)
TNF is a compound that is classified as a cytokine which plays a central role in the cellular mechanisms of apoptosis or cell death. However, there are a number of different kinds of TNF, just under twenty, but the family of molecules have very similar a...