Affirmative. You all carry residual energy signatures from the dimensional rift on the planet that you were pulled through to get to our universe. If this was something that followed you or the intervention team members that helped bring you to Legion World it'll carry the same signature.

[His eyes pop open wide.]

In fact, Jerem Hald is one of the intervention team members that brought you to the ship, if I'm not mistaken. He's a medical technician. It's possible he became infested while leaving the planet and it somehow eluded our scans. The scans only search for xenobiological hazards and other medical information -- not something so complex as isozonic trails.