Carma Hassan, CNN -
It took just 72 hours for me to lose my sight entirely. Just before my blindness hit, I had been laid up with an unknown virus that had left me suffering severe headaches and sweats. My body's immune system had gone haywire, responding to the virus by attacking my own nerves, causing loss of sight and mobility -- I had been struck down by biological friendly fire.
original story: http://rss.cnn.com/~r/rss/cnn_health/~3/J_B3SXXxSQw/index.html