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Virus Infections and Hosts
Virus Infections and Hosts

... ring spot and rose mosaic virus. There are far too many plant viruses to discuss each in detail, but symptoms of bean common mosaic virus result in lowered bean production and stunted, unproductive plants. In the ornamental rose, the rose mosaic disease causes wavy yellow lines and colored splotches ...
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Porcine reproductive and respiratory syndrome
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Dr. Tatsuo Miyamura, National Institute of Infectious Diseases
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... through JICA and the WHO. Recently we have been collaborating on noroviruses and hepatitis E viruses. The Mecca of hepatitis E science is India, who first reported control and molecular biology, cloning the hepatitis E virus. We developed a system to produce a virus-like empty particle, a good candi ...
Slide 1
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Chapter 19: Infectious Diseases Affecting the Skin and Eyes
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04-schat327-338.doc:chevalier 24/11/04
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Section 2: Energy Flow in Ecosystems
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Conventional and Molecular Detection of Infectious Bursal Disease
Conventional and Molecular Detection of Infectious Bursal Disease

... prominent white line of precipitation was noticed between known positive anti-IBDV hyper-immune serum of the central well and bursal homogenates of the peripheral wells due to antigen and antibody reaction within 24 and 48 h. The results are in agreement with the findings of Muhammad et al. (1996) a ...
Emerging and reemerging diseases
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... influenza virus. First, it is important to define the concept of pandemic; it results from the appearance of a new influenza virus that is transmitted between human beings and that represents and an epidemic of human influenza of large magnitude that affects two or more continents simultaneously. Ge ...
open - PAGE meetings
open - PAGE meetings

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Hepatitis B



Hepatitis B is an infectious disease caused by the hepatitis B virus (HBV) which 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, feeling tired, 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 results in the death of 15 to 25% of those with chronic disease.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. Diagnosis is typically 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.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 maybe 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, including 240 million to 350 million who have chronic infections. Over 750,000 people die of hepatitis B each year. About 300,000 of these are due to liver cancer. The disease is now only common in East Asia and sub-Saharan Africa where between 5 and 10% of adults have chronic disease. Rates in Europe and North America are less than 1%. It was originally known as serum hepatitis. Research is looking to create foods that contain HBV vaccine. The disease may affect other great apes as well.
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