using direct solid-phase radioimmunoassay ( dsp-ria ) which was shown to be specific and about 10000 times more sensitive than immunodiffusion and even 10 times more sensitive than the radioimmunoprecipitation test used by us before , anti-hbs was detected in 90 % of hepatitis b convalescents who were followed up for a one year observation period and who had eliminated hbs antigen from their sera ( 60/68 ) .
C0019163
hepatitis b
C0019168
hbs antigen