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The IgG subclass distribution of antibody to hepatitis B surface antigen (anti-HBs) was investigated in 19 children with chronic active hepatitis B infection who showed a complete serological seroconversion after interferon-alpha therapy. Determinations were done 6 and 12 months after treatment. Our results showed no selectivity in anti-HBs synthesis among IgG subclasses. All 4 IgG isotypes were involved in the response, with similar percentage contributions, on average, of IgG1 (35%), IgG3 (27%), and IgG4 (28%), followed by IgG2 (10%). IgG4 became the second most dominant isotype at the end of observation. These results are in contrast to those found after natural seroconversion, in which anti-HBs was highly restricted to neutralizing IgG1 and IgG3, with only a minor contribution from IgG2 and IgG4. It is postulated that analysis of the specific profiles of IgG subclasses may be of value for the estimation of the therapeutic efficacy of recombinant interferon-alpha used and may be helpful in choosing more-effective treatment.

IgG Subclass Distribution of Hepatitis B Surface Antigen Antibodies Induced in Children with Chronic Hepatitis B Infection after Interferon‐α Therapy