The construction site. Hmm. [Tony narrows his eyes.] The contaminant could be from there. That makes a lot of sense. I mean, who knows what kinds of nasty stuff Malicant might have left behind? I'll check things out over there, too.

[Tony's been fine and he spends a ton of time at the work site - but then, he's often in the suit, and Extremis boosts his immune system when he isn't. Come to think of it, he has heard some mentions of people getting sick. Maybe it's not just a bug going around: maybe it's related to this.]