Causes of acute exacerbations of chronic hepatitis B.

: The authors analyzed acute exacerbations of chronic hepatitis B in 24 chronic HBsAg carriers (20 with positive HBeAg, 4 with anti-HBe), more than half of whom were treated with glucocorticoids, by examining specific antigens and antibodies of the hepatitis A virus (HAV), hepatitis B virus (HBV), hepatitis delta virus (HDV), Epstein-Barr virus (EBV) and cytomegalovirus (CMV). Of 38 observed exacerbations of the disease they found in 7 (18%) deterioration after discontinuation of glucocorticoids, in 7 (18%) seroconversion of HBeAg to anti-HBe, in 9 (24%) spontaneous exacerbation of chronic hepatitis B, in 11 (29%) chronic activation, reactivation of EBV superinfection, in 3 (8%) CMV reactivation or superinfection and in one (3%) HDV superinfection. In no instance HAV superinfection was observed. Exacerbations were found five times more frequently in subjects in the stage of active viral replication (in HBeAg+ subjects) than in subjects with anti-HBe. In eight patients EBV reactivation was found after glucocorticoids withdrawal: in five patients after an average period of 5 months (range 3-7) and in three patients after an average period of 33 months (range 22-48). The results provide evidence that in addition to already known causes of acute exacerbations of chronic hepatitis B in our geographical area probably an important cause of deterioration of hepatitis is reactivation or superinfection with EBV and CMV in some patients in conjunction with previous glucocorticoid treatment.