RPC-XXX instances are kept in a standard biological bontainment room
containment.
During a two day period following this, the hair and nails of RPC-XXX
Should be RPC-XXX-A.
Any number of RPC-XXX instances from one to seven will grow outward from the head of RPC-XXX-A.
So, shampoo bottles will start growing out someone's head if they use it? Kinda breaks my suspension of disbelief to imagine whole bottles of shampoo popping out of someone's head. I could see some form of creature coming out, like some infant form of RPC-XXX, that eventually becomes the shampoo bottles. But not just flat out bottles of shampoo growing out of someone's head, at least, without killing the person (imagine whole shampoo bottles trying to grow out of hair roots. not pretty).
I could see that happening as is, just not the subjects living through the whole ordeal.
Other than that, its got good body horror. Just enough to make your skin crawl, but not enough to make you sick, so good job on that.
TLDR: Make the birthing process more lethal or change what comes out of the victim.