<Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Hepatitis B is an infectious disease caused by the hepatitis B virus (HBV) that affects the liver . It can cause both acute and chronic infections . Many people have no symptoms during the initial infection . Some develop a rapid onset of sickness with vomiting, yellowish skin, tiredness, dark urine and abdominal pain . Often these symptoms last a few weeks and rarely does the initial infection result in death . It may take 30 to 180 days for symptoms to begin . In those who get infected around the time of birth 90% develop chronic hepatitis B while less than 10% of those infected after the age of five do . Most of those with chronic disease have no symptoms; however, cirrhosis and liver cancer may eventually develop . These complications result in the death of 15 to 25% of those with chronic disease . </P> <P> The virus is transmitted by exposure to infectious blood or body fluids . Infection around the time of birth or from contact with other people's blood during childhood is the most frequent method by which hepatitis B is acquired in areas where the disease is common . In areas where the disease is rare, intravenous drug use and sexual intercourse are the most frequent routes of infection . Other risk factors include working in healthcare, blood transfusions, dialysis, living with an infected person, travel in countries where the infection rate is high, and living in an institution . Tattooing and acupuncture led to a significant number of cases in the 1980s; however, this has become less common with improved sterility . The hepatitis B viruses cannot be spread by holding hands, sharing eating utensils, kissing, hugging, coughing, sneezing, or breastfeeding . The infection can be diagnosed 30 to 60 days after exposure . The diagnosis is usually confirmed by testing the blood for parts of the virus and for antibodies against the virus . It is one of five known hepatitis viruses: A, B, C, D, and E . </P> <P> The infection has been preventable by vaccination since 1982 . Vaccination is recommended by the World Health Organization in the first day of life if possible . Two or three more doses are required at a later time for full effect . This vaccine works about 95% of the time . About 180 countries gave the vaccine as part of national programs as of 2006 . It is also recommended that all blood be tested for hepatitis B before transfusion and condoms be used to prevent infection . During an initial infection, care is based on the symptoms that a person has . In those who develop chronic disease, antiviral medication such as tenofovir or interferon may be useful; however, these drugs are expensive . Liver transplantation is sometimes used for cirrhosis . </P>

Where did the hepatitis b virus come from
find me the text answering this question