Free HB (and infectious duck hepatitis B irus) transcytosed across trophoblastic cells at a rate of 5% in 30 min. iral transport occurred in microtubule-dependent, endosomal esicles.

• 单个乙肝病毒（和感染鸭乙肝病毒）30分钟以5%25的速率穿过滋养层细胞。病毒的转运发生在微管依赖的内体小泡。