| hepatitis delta virus infection in northern ireland 1970-1989. | the incidence of hepatitis delta virus (hdv) infection in northern ireland (1970-1989) was tested by enzyme linked immunosorbent assay in 401 hepatitis b surface antigen (hbsag) positive sera. hepatitis delta antigen (hdag) was tested in 388 patients and antibody to delta antigen (anti-hd) in 401 patients. four patients (1.03%) were hdag positive. nine patients (2.24%) were positive for anti-hd and after acid pre-treatment of sera from eight of these patients, five were positive for hdag. the ov ... | 1991 | 1785149 |