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。
The applicability of these findings to extremely preterm, extremely low birth weight or growth restricted infants is limited.
这些关于极度孕期早产儿或者极低出生体重婴儿的试验结果的适用性非常有限。
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