People say that it's hard to top Mother Nature in the weird parasite category, and might dislike the entry on those grounds. I happen to like it. I especially like the creep vibe you get from imagining a fluffy little kitten with worms instead of hair, or the fact that cut "hair" can grow a new head and burrow into a new host … no thank you, I'm glad I'm not a stylist. It works especially well for me because I can believe the little bastards actually exist, and that's not cool. Or imagining MC&D (or maybe just a random entrepreneur) offering a treatment for balding individuals, just a simple powder you apply to the scalp …
On the other hand, I didn't like the story about the capture. Maybe it's just me being anal, but it seems like every time a Foundation employee takes a vacation or goes to the grocery store they stumble across another SCP. Cut the mention of the researcher just happening to find and contain the first known instance of 189 and it will help.