the process of protecting a person or animal from an infectious disease by putting a substance into the body that makes it produce antibodies (= proteins in the blood that fight disease)

mass/routine immunization 大规模／例行接种

Immunization gives people the ability to resist infection temporarily or permanently. 免疫接种可让人可以永久或暂时地抵抗感染。

With the use of immunizations in babies, the mortality rate has dropped significantly. 开展婴儿免疫接种以来，死亡率显著下降了。