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The presence of surface antibody (anti-HBs) indicates an individual with immunity to hepatitis B, whether due to previously resolved infection or due to hepatitis B vaccination. [65] For example, an individual who has never had any exposure to HBV, either by vaccine or by infection, would test negative for the entire serology panel.
Hepatitis B virus DNA remains in the body after infection, and in some people, including those that do not have detectable HBsAg, the disease recurs. [100] [101] Although rare, reactivation is seen most often following alcohol or drug use, [102] or in people with impaired immunity. [103] HBV goes through cycles of replication and non-replication.
Hepatitis B virus (HBV) is a partially double-stranded DNA virus, [1] a species of the genus Orthohepadnavirus and a member of the Hepadnaviridae family of viruses. [ 2 ] [ 3 ] This virus causes the disease hepatitis B .
The genome organisation of HBV; the genes overlap. ORF S, in green, encodes HBsAg. HBsAg under a transmission electron microscope: the protein self assembles into virus-like particles. HBsAg (also known as the Australia antigen) is the surface antigen of the hepatitis B virus (HBV). Its presence in blood indicates existing hepatitis B infection.
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Viral hepatitis is liver inflammation due to a viral infection. [1] [2] It may present in acute form as a recent infection with relatively rapid onset, or in chronic form, typically progressing from a long-lasting asymptomatic condition up to a decompensated hepatic disease and hepatocellular carcinoma (HCC).
Hepatitis A and E are mainly spread by contaminated food and water. [3] Hepatitis B is mainly sexually transmitted, but may also be passed from mother to baby during pregnancy or childbirth and spread through infected blood. [3] Hepatitis C is commonly spread through infected blood such as may occur during needle sharing by intravenous drug ...
The genome organisation of HBV. Some genes overlap. (ORF Core, at bottom left, encodes HBcAg. HBcAg (core antigen) is a hepatitis B viral protein. [1] [2] It is an indicator of active viral replication; this means the person infected with Hepatitis B can likely transmit the virus on to another person (i.e. the person is infectious).
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