RÉSUMÉ
<p><b>OBJECTIVE</b>To explore the inhibitory effect of combination of lamivudine with thymosin alpha1 (Talpha1) on the replication of duck hepatitis B virus (DHBV).</p><p><b>METHODS</b>Peking ducks of 1 d old were challenged with DHBV-positive serum and used as a duck hepatitis B model. After treated with lamivudine for three months, the ducks were randomly grouped and treated with or without Talpha1 for 8 d. Serum DHBV titrate was observed by semi-quantitative PCR, and inflammation and degeneration of hepatocytes were observed by pathology examination.</p><p><b>RESULTS</b>The serum DHBV titrate was significantly reduced (4483.2+/-5193.4 compared with 9351.8+/-5059.6) after lamivudine treatment, and it was reduced more significantly(1692.2+/-589.2) after combination treatment with Talpha1. Lamivudine reduced the degeneration degree of hepatocytes (3.2+/-0.8 compared with 4.6+/-0.5) and the inflammation degree of liver (6.2+/-3.3 compared with 8.6+/-2.8). The combination treatment with Talpha1 increased liver inflammation degree (9.0+/-5.2).</p><p><b>CONCLUSION</b>Both Talpha1 and lamivudine may reduce the replication of DHBV in Peking ducks and combination treatment may have the better anti-virus effect and enhance immune response in liver.</p>