"You need to, Your a time lord. If your already infected its best to before it starts to surface and I don;t want you at risk even if you don't have." There was a firm brotherly tone in his voice. 
The Doctor didn't want her at risk, she was his sister and didn't want her to go through this "Please for me? It will be easier for me to get better If I dont have your health to worry about too." He forces a small smile. He hopes Jack will make her if he can't.
Ianto was looking at Jack "Ah yeah, and no problem, always happy to help sir." he knew Owen would be very tired. It was best to let him to sleep, he knew it wasn't comfortable, he had thought he would be better off laying on a couch or going home.