Hepatitis B is caused by a highly contagious virus that infects the liver.
Hepatitis B is caused by a highly contagious virus that infects the liver.
乙肝是由一种高度传染性的嗜肝细胞病毒感染所致。
Hepatitis B is caused by a highly contagious virus that infects the liver.
乙肝是由一种高度传染性的嗜肝细胞病毒感染所致。