(Edited the OOC)
Jack and the TARDIS were trying to match the blood samples together while Arwen went to sit with the Doctor, only to become worried and notice what was off with the Doctor. "Doctor?" She looked around the room, then looked to Jack. "Pause that Jack. Something is infecting the Doctor," 
Jack had looked around to see the Doctor was looking dizzy and had laid down to try and get the room to stop spinning. "What's going on? He was fine just minutes ago." 
The red head shrugged till she thought about it and wondered something. "Could it have been something he ate? He had the Jammy Dodgers not long before we did this. Check the air particles just in case." She advised, unsure how she knew any of that. But Jack went back to the scanners and had the TARDIS scan for any air toxins that shouldnt be in the TARDIS.