Abstract
The effect of 2′,3′-dideoxycytidine, a potent antiviral agent, which, following anabolic phosphorylation, inhibits the reverse transcriptase of the human immunodeficiency virus in vitro, was assessed in 16 Pekin ducks chronically infected with the duck hepatitis B virus. Nine ducks were given 11 mg/m2 of dideoxycytidine intravenously every 6 h, and 7 ducks received no treatment. Serum duck hepatitis B virus deoxyribonucleic acid and deoxyribonucleic acid polymerase activity decreased in every duck treated with dideoxycytidine. The mean inhibition of deoxyribonucleic acid polymerase and duck hepatitis B virus deoxyribonucleic acid on the third day of treatment measured 64% (p < 0.01) and 73% (p < 0.01), respectively. The inhibition of deoxyribonucleic acid polymerase persisted after treatment was stopped, and 4 ducks continued to show >50% inhibition 12 days after stopping treatment. Duck hepatitis B virus deoxyribonucleic acid, which was measured in total cellular deoxyribonucleic acid extracted from liver biopsy specimens obtained before and on the last day of treatment with dideoxycytidine, showed an average inhibition of 96% in 3 ducks treated with dideoxycytidine, but showed no decrease in the remaining 5 ducks. Thus, dideoxycytidine has potent antiviral activity against duck hepatitis B virus and warrants further evaluation as an antiviral agent in the treatment of chronic hepatitis B virus infection in humans.
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