Keller: The disease is in the ship?
Todd: It is the only explanation that makes sense.
Sheppard: All right, if you say so.
Keller: How is that even possible?
Todd: During the process of hibernation, there is a continuous exchange of fluid between Wraith and Hive.
(John looks disgusted.)
Todd: The disease must have been transmitted in this manner.
Sheppard: Great, so we're flyin' around in a giant tumor.