See, this is not a metaphor. When Elesh Norn says infection, she’s talking about the kind that gets in your body and makes you sickl. It’s right there in front of us, that giant black blob. Nothing ambiguous about this one.
Is this character finding sins to prod me towards or prodding my sins? Frankly, it sounds like the latter, which seems a bit unconventional. Don’t get me wrong; I’m not particularly keen on either scenario. Still though, it’s a bit ambiguous.