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Hepatitis B infection has been preventable by vaccination since 1982. [4] [12] As of 2022, the hepatitis B vaccine is between 98% and 100% effective in preventing infection. [1] The vaccine is administered in several doses; after an initial dose, two or three more vaccine doses are required at a later time for full effect. [1]
Hepatitis D is a defective virus that requires hepatitis B to replicate and is only found with hepatitis B co-infection. [17] In adults, hepatitis B infection is most commonly self-limiting, with less than 5% progressing to chronic state, and 20 to 30% of those chronically infected developing cirrhosis or liver cancer. [31]
Acute hepatitis B; Acute hepatitis C; Acute hepatitis D – this is a superinfection with the delta-agent in a patient already infected with hepatitis B; Acute hepatitis E; Chronic viral hepatitis; Other viral hepatitis viruses may exist but their relation to the disease is not firmly established like the previous ones (hepatitis F, GB virus C ...
HBsAg (hepatitis B surface antigen) was the first hepatitis B virus protein to be discovered. [15] It consists of small (S), medium (M) and large (L) protein. [16] HBcAg (hepatitis B core antigen) is the main structural protein of HBV icosahedral nucleocapsid and it has function in replication of the virus. [17]
Viral hepatitis is either transmitted through contaminated food or water (A, E) or via blood and body fluids (B, C). The viruses transmitted through water and food are mostly self-limited, resulting in acute illness with full resolution.
This controversy created public misgivings about hepatitis B vaccination, and hepatitis B vaccination in children remained low in several countries. A 2006 study concluded that evidence did not support an association between hepatitis B vaccination and sudden infant death syndrome , chronic fatigue syndrome , or multiple sclerosis. [ 52 ]
The most common blood-borne diseases are hepatitis B, hepatitis C, and human immunodeficiency virus. [11] Exposure is possible through blood of an infected patient splashing onto mucous membranes; however, the greatest exposure risk was shown to occur during percutaneous injections performed for vascular access.
The list of conditions associated with chronic liver disease is extensive and can be categorised in the following way: [3]. Viral causes. Hepatitis B; Hepatitis C; Cytomegalovirus (CMV), Epstein Barr virus (EBV), and yellow fever viruses cause acute hepatitis.