Good catch... I'll have to give them a closer sniff the next time I'm around them.

[He'd been so disoriented and unsettled by this place at first, that he hadn't noticed such things. He honestly hadn't wanted to get too close to them lest he end up infected somehow. But this should be a pretty useful clue to exploit.]

Then we'll start by smelling out some probable targets. From there... we track their movements. Following them won't be easy, so we must proceed with extreme caution.