Inhibition of Duck Hepatitis B Virus Replication in vivo by the Nucleoside Analogue Ganciclovir (9-[2-hydroxy-1-(hydroxymethyl) ethoxymethyl] Guanine)

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Abstract
Treatment of ducks congenitally infected with the duck hepatitis B virus (DHBV) using the guanosine analogue ganciclovir resulted in prompt and profound inhibition of viral DNA replication in serum and liver. By the end of the treatment period all the replicative intermediates, except the supercoiled DNA form, could not be detected. Within 2 weeks of cessation of treatment viral replication returned and, in some cases, rebound occurred. Sequential treatment with prednisolone followed by ganciclovir also resulted in inhibition of viral replication and, even though relapse was observed after therapy was discontinued, the rebound phenomenon was reduced. Ganciclovir significantly and selectively inhibited DHBV DNA replication but may be more efficacious if used in combination with compounds targeted to the viral supercoiled DNA form.

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