PHLOX: It's a nearly perfect replica. I've never seen a lifeform duplicated in such extraordinary detail, from its epidermis down to its cellular proteins. This is remarkable work.
PHLOX: I inoculated the entire crew to prevent an outbreak. Would you mind rolling up your sleeve? (puts a cuff over Archer's wrist and shows his bloodstream on the monitor) The vaccine contained millions of genetically altered microbes. Most of them are still in your bloodstream. They typically survive for, oh, at least several weeks. (does the same for the body) Every one of the alien microbes in this body is dead.
PHLOX: These microbes thrive on isolytic energy. If anything, they would have multiplied. I believe that someone, or something, has abducted Ensign Mayweather and left this facsimile in his place.
Phlocks: It's ironic, in a way. The station can duplicate a dead human body in all its exquisite detail yet a living, simple, one-celled organism is beyond its capability.
ARCHER: You'd better hold off. Their son may still be alive. You and Trip managed to get pretty far inside the station. How close do you think you got to the computer core?