Job's syndrome no problem for 7-year-old motorbike champ Colton Nelson

Colton Nelson is only seven and he races motorbikes, even though he has a rare immune disorder called Job’s syndrome.

It's just a few minutes until the races begin, and Colton Nelson still isn’t dressed.The seven-year-old has been romping around the Gold Country Fairgrounds, in Auburn, US, in partial gear for nearly an hour, skirting among tents to peek at the growling motorcycles in the dusty Auburn night.