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.

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.

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.

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.

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.