Vaccines for measles-mumps-rubella and varicella, or chicken pox, are effective in extremely preterm infants, even though preemies' immune systems are not as developed as full-term babies.
麻疹、腮腺炎、风疹和水痘疫苗对极度早产的婴儿有效，即使早产儿的免疫系统发育的并不像足月产婴儿一样。
Brain injury in late period term infants mainly had cystoid alteration and atrophy in brain substance while preterm infants had mainly white matter malacia surrounding the brain ventricle.
晚期脑损伤足月儿以脑实质内囊腔样改变和脑萎缩改变为主，早产儿以脑室周匿白质软化为主。
The same number of preterm infants and full-term infants in the study reached a level of immunity considered protective against the diseases.
此研究中达到一定免疫水平的早产儿和足月婴儿数量相同。
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