Among them, DHV-1 is the most virulent, since the mortality rate can reach high up to 80% once ducklings infected within 3 weeks old.
三种鸭肝炎病毒以DHV - 1病原性最强，当3周龄以内之小鸭感染DHV - 1病毒时，其致死率高达80%以上。
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