A Study to Compare the Efficacy of Hepatitis A Vaccine and Immune Globulin When Given After Exposure to Hepatitis A
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Immune globulin is effective about 85% of the time in preventing hepatitis A in people who have been exposed, if it is given within 14 days of exposure. Several lines of evidence suggest that hepatitis A vaccine might also be effective in this setting, and vaccine has the advantage of providing long term protection. In this study, we compare how well immune globulin and hepatitis A vaccine work in preventing clinical hepatitis A in household contacts of persons with the disease. The study's hypothesis is that the the proportion of exposed household contacts who receive hepatitis A vaccine within 14 days of exposure and develop hepatitis A disease will be similar to the proportion of exposure household contacts who receive immune globulin within 14 days of exposure and develop hepatitis A disease.
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Ages Eligible for Study:
2 Years to 40 Years (Child, Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Inclusion Criteria: Exposure to an index case of hepatitis A within 14 days of onset of illness; at least 2 years and no more than 40 years of age at time of study entry; susceptible to hepatitis A; give informed consent or have informed consent given by a responsible parent/guardian -
Exclusion Criteria: history of hepatitis A; prior receipt of hepatitis A vaccine; receipt of immune globulin within 180 days before study entry; evidence of liver disease; receipt of any live virus vaccine within 21 days prior to study entry; moderate or severe intercurrent illness or axillary temperature of 37.5 degrees or higher at time of study entry; various other medical conditions;