But patients with more severe forms can go blind. Some develop encephalitis, a brain disease that can lead to headaches, coma or seizures. And some patients bleed to death.

但是，一些病人病叫严重，甚至可能会失明。一些人还会患脑炎，导致头痛，昏迷和抽搐。一些人甚至会流血过多造成死亡。