1. Seth is going to have a second bone marrow transplant on March 27th 2015.Seth's family is asking people to please wear yellow and take a picture then post it on to facebook on wearyellowforseth. 2.Yellow signifies a strong immune system.Seth grew up to like the color yellow and he has a yellow room also he loves seeing his little brother dress up in yellow. 3.Severe Combined Immunodeficiency (SCID) is a genetic condition that arises when the body is born without T cells - the most important white blood cells.It is called bubble boy disease because the first kid to have it had to stay in a plastic germ free bubble for the rest of his life.