exercising too much or something. >> the symptoms lingered. one month later reese seemed to be getting worse, not better. >> initially we thought maybe it is because reese is in preschool, in nursery school and you know how kids just -- they constantly just contaminate one another with a little bug or virus. >> doctors could find nothing wrong. tests were inconclusive. when he was taking for allergy tests, those too were negative. soon reese's problems moved from respiratory to neurological. reese who had learned his abcs from a-z suddenly couldn't get past d. >> he was deteriorating quickly and we were taking him to doctor after doctor after doctor. and they told us something was wrong but they didn't know what it was.