We call that verticaltransmission, but there is probably a mixture of this and the algae being absorbed from the environment.
我们称之为垂直传递，但可能两种情况都存在，海藻也可以是从环境中吸收进来的。
2
Less frequently, it is due to infection through blood transfusion, verticaltransmission (from infected mother to child) or organ donation.
在较少的情况中，通过输血，纵向传播(母婴感染)或器官捐献也造成感染。
3
The transmission of HIV from an HIV-positive mother to her child during pregnancy, Labour, delivery or breastfeeding is called vertical or mother-to-child transmission.