Hepatocellular carcinoma in Alaska Eskimos: epidemiology, clinical features, and early detection.
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The long-term immunogenicity and protection provided by a plasma-derived hepatitis B vaccine (Heptavax B) was determined in a cohort of susceptible persons immunized in 1981. In this study 1581 susceptible persons were immunized with the recommended three-dose regimen of hepatitis B vaccine. After 7 years, 74% of vaccinees retained antibody to hepatitis B surface antigen (anti-HBs) levels of 10 mIU/mL or more. Anti-HBs levels at 7 years varied inversely with age and directly with the level of anti-HBs attained 1 year after the first dose. During the 7 years after the first dose of vaccine, five vaccine responders and three other persons developed antibody to hepatitis B core antigen and their level of anti-HBs increased. None developed detectable hepatitis B surface antigen or clinical hepatitis. This update of an ongoing study continues to suggest that the risk of hepatitis B virus infection to most persons with an initial anti-HBs response to hepatitis B virus vaccine of 10 mIU/mL or greater is low, regardless of the initial antibody level.
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Significant differences of taste thresholds for different sugars, salt, organic acids, and bitter products, observed in human populations in contrasted environments, are related to potential variations of traditional diet. In this respect, biochemical composition of the environment would be the major selective pressure for taste perception.
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