User:Mr. Ibrahem/Hepatitis B

Hepatitis B is a viral hepatitis, an infectious disease caused by the hepatitis B virus (HBV) that affects the liver. It can cause both acute and chronic infection. Initially there are typically no symptoms. In acute infection, some may 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. Cirrhosis or liver cancer occur in about 25% of those with chronic disease.

Hepatitis B virus is one of five main hepatitis viruses along with A, C, D, and E. The virus is spread 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 sterilization. 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.

The infection has been preventable by vaccination since 1982. Babies born to mothers with hepatitis B may be offered hepatitis B immune globulin and vaccine at birth. 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 that 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, entecavir,or interferon may be useful; however, these drugs are expensive. Liver transplantation is sometimes used for cirrhosis.

About a third of the world population has been infected at one point in their lives. Globally in 2019, there were 296 million people with hepatitis B, with 1.5 million new cases a year. 820,000 deaths were recorded in 2019. The disease is most common in the Western Pacific and African regions; with a combined near 200 million people affected in 2019. In 2019 there were around 14 million affected in the region of Europe and 5 million in the Americas. Being also infected with HIV, hepatitis C, or hepatitis D is common where hepatitis B regularly occurs. Services to test and prevent hepatitis B were frequently adversely affected during the COVID-19 pandemic. It was originally known as "serum hepatitis".