I heard your conversation with O'Hara. I didn't like to butt in, but I wanted to give you some information to consider.
Some time ago, I went home for a while myself. When I was back, I was stationed in some godawful part of the world, and there I contracted Yellow Fever. Utterly deadly by all accounts, and I was at death's door by the time I returned. There was nothing to be done but to make my last days comfortable.
O'Hara played no small part in saving my life, and ensuring that it was no longer a threat to me. He was part of a team, of course, as I was actively dying, but he is more than capable of creating a preventative vaccine for your nephew.