| unexpected low prevalence of delta antibodies in the east amazon region and são paulo: evidence for regional differences in the epidemiology of delta hepatitis virus within brazil. | antibodies (anti-hd) to hepatitis delta virus (hdv) were tested by radioimmunoassay in 207 human serum samples from the eastern amazon (states of pará and amapá) and são paulo, brazil. 42 amazon hbsag asymptomatic carriers were negative for anti-hd. 84 são paulo hbsag asymptomatic carriers were also negative. among the 81 hbsag patients from são paulo with different liver diseases, only one had anti-hd. liver biopsy of this chronic active hepatitis case was positive for hbsag, hbcag and hdag in ... | 1987 | 3445327 |