They seem to have originated from the newly opened Agriculture Wing, although my only estimate as to their numbers is a very useful 'shit ton'. Considering their cliche horror movie aspects in other areas, I wouldn't take any chances on being bitten.

[her tone continues to be pleasantly conversational, but after her run-in with Sarah there's a small hint of a cold front coming in should he rag on her weapons too much]

Yes, knitting needles. It's what I typically use and considering their effectiveness I haven't seen any reason to change.