Let's increase the poison damage, given that it does hp damage in the original and can continue to do Str and Con damage over a long time in the original. Maybe 1 Str and Con damage initial and 1d4 or 1d6 Str and Con secondary?
Hmmm... we might want to rework this as non-traditonal poison, since it did ongoing damage. Otherwise it might be too powerful for its likely very-low CR.