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Hepatitis A is an infectious disease of the liver caused by Hepatovirus A (HAV); [7] it is a type of viral hepatitis. [8] Many cases have few or no symptoms, especially in the young. [ 1 ] The time between infection and symptoms, in those who develop them, is two–six weeks. [ 2 ]
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 ...
Hepatitis D is caused by the hepatitis D virus (HDV), or hepatitis delta virus; it belongs to the genus Deltavirus. HDV is similar to a satellite virus as it can only propagate in the presence of the hepatitis B virus, depending on the helper function of HBV for its replication and expression. It has no independent life cycle, but can survive ...
Hepatitis A vaccine is a vaccine that prevents hepatitis A. [2] [3] It is effective in around 95% of cases and lasts for at least twenty years and possibly a person's entire life. [4] If given, two doses are recommended beginning after the age of one. [2] It is given by injection into a muscle. [2]
Although liver diseases transmissible among human populations were identified early in the history of medicine, the first known hepatitis with a viral etiological agent was Hepatitis A, in the picornaviridae family. Hepatitis B Virus (HBV) was identified as an infection distinct from Hepatitis A through its contamination of yellow fever vaccine.
In 1989, investigators from the CDC (Daniel W. Bradley) and Chiron (Michael Houghton) identified the hepatitis C virus, which had previously been known as non-A, non-B hepatitis and could not be detected in the blood supply. [12] Only in 1992 was a blood test created that could detect hepatitis C in donated blood. [12]
In the 1960s, the first virus that could cause hepatitis was discovered. This was hepatitis B virus, which was named after the disease it causes. [220] Hepatitis A virus was discovered in 1974. [221] The discovery of hepatitis B virus and the invention of tests to detect it have radically changed many medical, and some cosmetic procedures.
Combined hepatitis A and B vaccine, is used to provide protection against hepatitis A and hepatitis B. [3] [7] It is given by injection into muscle.[8]It is used in areas where hepatitis A and B are endemic, for travelers, people with hepatitis C or chronic liver disease, and those at high risk of sexually transmitted diseases.