虽然没有普遍的生命威胁，但麻疹，腮腺炎，风疹和水痘都有严重的并发症。

Although not generally life-threatening, measles, mumps, rubella and chicken pox can all have serious complications.

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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。

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.

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