Case of adult genotype C HBV carrier after acute hepatitis B, losing HBsAg and acquiring HBsAb after IFN and lamivudine treatment.

Here we report the case of a 48-year-old man, carrier of genotype C HBV for longer than 6 months after contracting sexually transmitted acute hepatitis B, who eventually lost HBsAg and acquired HBsAb by IFN/lamivudine therapy. The patient had been negative for HBsAg in 2001, but, during his stay in China from January to July in 2003, he developed acute hepatitis B after having an extra-marital sexual contact there. HBsAg was still positive and a liver biopsy indicated chronic hepatitis when he was admitted to our hospital in December 2003 for detailed examination of liver dysfunction. HBV DNA in his serum, revealed to segregate to genotype C by sequencing on admission, decreased to undetectable levels at the end of a 3-month IFN therapy, and remained undetectable during and after the successive 6-month lamivudine therapy. HBeAg seroconverted to HBeAb during the therapy, and HBsAb appeared after the therapy. To our knowledge, this is the first case of genotype C chronic hepatitis B occurring after acute hepatitis.