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Guidelines for the prevention, care and treatment of persons with chronic hepatitis B infection

Langue : Anglais
Hepatitis B infection is caused by the hepatitis B virus (HBV), an enveloped DNA virus that infects the liver, causing hepatocellular necrosis and inflammation. HBV infection can be either acute or chronic, and the associated illness ranges in severity from asymptomatic to symptomatic, progressive disease. Chronic hepatitis B (CHB) – defined as persistence of hepatitis B surface antigen (HBsAg) for six months or more – is a major public health problem. Worldwide, there are an estimated 240 million chronically infected persons, particularly in low- and middle-income countries (LMICs). The major complications of CHB are cirrhosis and hepatocellular carcinoma (HCC). Between 20% and 30% of those who become chronically infected will develop these complications, and an estimated 650 000 people will die annually due to CHB. The majority of people are unaware of their HBV infection, and therefore often present with advanced disease. Universal hepatitis B immunization programmes that target infants, with the first dose at birth, have been highly effective in reducing the incidence and prevalence of hepatitis B in many endemic countries. However, these programmes will not have an impact on HBV-related deaths until several decades after their introduction. Antiviral agents active against HBV are available, and have been shown to suppress HBV replication, prevent progression to cirrhosis, and reduce the risk of HCC and liver-related deaths. However, currently available treatments fail to eradicate the virus in most of those treated, necessitating potentially lifelong treatment. In addition, these drugs are not widely available or used in LMICs, and therefore timely intervention to prevent the onset of advanced liver disease does not occur. These are the first World Health Organization (WHO) guidelines for the prevention, care and treatment of persons living with CHB infection, and complement similar recent published guidance by WHO on the prevention, care and treatment of infection due to the hepatitis C virus (HCV). In contrast to several recent international guidelines on the management of CHB infection from the United States, Europe, Asia-Pacific and the United Kingdom (UK), the primary audience for these WHO guidelines is country programme managers in all settings, but particularly in LMICs to help plan the development and scale up of hepatitis B prevention, care and treatment. These guidelines are also intended for health-care providers who care for persons with CHB in these settings.

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