Although most people recover from the highly contagious viral disease, some suffer serious complications like blindness, encephalitis, severe diarrhea, pneumonia and ear infections.

虽然大部分病患治愈，但是有些却导致严重的后遗症，如失明，脑炎，严重腹泻，肺炎以及耳部感染。

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Encephalitis is more serious than meningitis, because it affects the brain itself.

脑炎是更严重的脑膜炎，因为它影响到大脑本身。

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Viral encephalitis is a common cause of symptomatic epilepsy. The most frequent and serious epilepsy is generated by herpes simplex encephalitis.

病毒性脑炎是症状性癫癎的常见原因，单纯疱疹病毒性脑炎引起癫癎最常见也最为严重。

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"Less than 1% develop a serious neurologic illness such as encephalitis or meningitis (inflammation of the brain or surrounding tissues), " it said.

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"Less than 1% develop a serious neurologic illness such as encephalitis or meningitis (inflammation of the brain or surrounding tissues), " the CDC said.

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However, the vaccine can have serious side effects -- including encephalitis, which can sometimes be fatal -- so health officials want to give it only to people who need it.

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