Well, the odds that shes carrying an airborne virus would have shown up in a couple of days, since those have a pretty short lively hood.
now for fluid transmitions, thats a whole other story, so she will need to have bloodwork done, the fear of STDs might be huge too, since most humans today carry a small amount of the herpes virus already, it might outright kill her, and who knows what shes carrying, so sexual intercourse, hell even kissing is off the table.
I wonder if thats a reason why he hasnt touched her along with the age difference and stuff.