In addition, it is hoped that non-human adenovirus will be safer than adenovirus.
Instead of using a retrovirus (as Japanese scientists had done) that can cause cancer, they are using an adenovirus which is safe.
The adenovirus he received was simply a vector, bringing a missing gene to his cell.
adenovirus ad·e·no·vi·rus (ād'n-ō-vī'rəs)
Any of the viruses of the family Adenoviridae. Also called adenoidal-pharyngeal-conjunctival virus.