Human herpesvirus-6 was frequently detected in Japanese pediatric patients with fulminant non-A, non-B, non-C hepatitis. Although the significance of human herpesvirus-6 in liver pathogenesis remains unclear, this virus may replicate in hepatocytes in some patients with acute onset hepatitis.
The degree of escape by the mutant envelope protein differed according to antibody type. Of the three types of antibody used in this study, HBV immunoglobulin was least affected by mutation in the a-loop. There appears to be no correlation between antigenicity and immunogenicity of the escape mutant, and the a-loop mutant may cause hepatitis with the usual serum viral markers.
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