liver sections from 18 patients positive for hepatitis b surface antigen ( hbsag ) , and from 12 negative patients , were examined for the presence of hepatitis b virus ( hbv ) dna using an in situ hybridization assay that would identify only those hepatocytes containing more than 10 to 15 hbv genome equivalents per cell .
C0019168
hepatitis b surface antigen
C0019163
hepatitis b