Their inflammation

is most marked over the cerebral hemisphere. Paralysis of the half of the body occurs. There is erratic rigidity of the limbs. The superficial reflexes disappear on both sides.  The pupils at first are equally contracted; later they become dilated and fixed. Both optic discs are œdematous and swollen.

Gradually s/he becomes unconscious, shows signs of increasing intra-cranial tension, slowing of the pulse, and laboured respiration.

The temporary relief of symptoms follows the withdrawal of cerebro-spinal fluid by repeated lumbar puncture. 

Nevertheless, the condition will be fatal within three or four days.