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With crude virus suspensions from stool and antibodies from hepatitis-A patients, a solid-phase radioimmunoassay (RIA) for detection of hepatitis virus A (HVA) had antibodies against hepatitis virus A (anti-HVA) has been developed. Examples for the application of this test are demonstrated. Virus particles from the stools of the two patients were further characterized. Serologically, they were identical or very similar to the MS-1 strain. Isopycnic CsCl-gradient centrifugation of both strains revealed two peaks, but the particles of different densities did not differ in size or serologically. A modification of the RIA was also useful for determination of IgM antibodies in patients' sera fractionated by sucrose-density centrifugation. The application of the RIA method for serologic epidemiology is demonstrated by a comparison of anti-HVA prevalence in German and non-German women residing in Germany.
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