Brave Seth Lane was born without an immune system and has lived in a sterile germ-free environment for more than half of his short life.<br /><br />Following an unsuccessful bone marrow transplant his own cells turned on him, and since January he has been forced to live in a single hospital room which he can't leave.<br /><br />Seth - who is awaiting another transplant - recorded an adorable video asking people to wear his favourite colour yellow on March 27 to show they are thinking of him.<br /><br />His parents Leanne and Nik, from Corby, Northamptonshire, were astonished when the video went viral and racked up nearly 2,500,000 views on YouTube in a matter of days.<br /><br />Hundreds of thousands of strangers worldwide have pledged to wear yellow and send photos which will be used to decorate Seth's hospital room to show he's not alone.
