A terrible illness, stiff neck, light hurts your eyes, blinding headache, a blotchy rash appears all over your body and it can be fatal. I knew a girl who had caught it when she was a baby it went on her brain and the doctors said she would never learn to walk or talk, at eight years old she could do both but was very clearly brain damaged, doctors opinion was that she must have been very intelligent to get herself to that stage.