孕妇感染病毒后，可经胎盘引起胎儿感染，此即病毒的宫内感染，病毒的这种传播方式称为宫内传播。相当一部分病毒可在人类子宫内经胎盘传播给胎儿，因而造成流产、早产、新生儿畸形或出生后长期病毒携带乃至恶性肿瘤。尽管目前已有或正在研制针对这些病毒感染的疫苗，从而... Pregnant women infected with the virus, the fetus can cause fetal infection by the placenta, which is the virus intrauterine infection, the virus is called intrauterine transmission of this means of transmission. A considerable portion of the virus can be transmitted intrauterine in the human uterus through the placenta, resulting in miscarriage, premature birth, neonatal malformations or long-term post-natal virus carriers and malignant tumors. Despite the current or ongoing development of vaccines against these viral infections, ...