Little Seth Lane was born with a rare condition which means he has no immune syndrome.
His parents Leanne and Nik filmed of a video of the five-year-old, asking people to wear his favourite colour, yellow, last Friday, and share their photographs online so he could see them.
The video was viewed more than two million times and messages began to flood in from all over the world.
Seth, whose condition was caused by a mutated gene, has been in a sterile room, nicknamed a “bubble”, at the Great North Children’s Hospital in Newcastle, since January, as he awaits a life-saving bone marrow transplant.
Leanne, who grew up in Chorley, now lives in