1.   Aguilar said that at the same meeting on Sunday, a European gene therapy group also reported an early stage success in combatting an immune disease.

2.   The immune disease it causes is called X-linked lymphoproliferative syndrome, or XLP.

3.   Cord blood stem cells are used in the treatment of infant leukemia and immune diseases.

4.   French scientists have used gene therapy to restore an apparently normal immune system to two babies born with a rare, life-threatening immune disease.

5.   Health officials are extremely wary of offering vaccinations to all Americans because the vaccine can cause severe side effects, especially in children and people with immune diseases.