While many of the new creatures produced by the Mi-go mutagen are aggressive, and most are hazardous in at least some way, some are also useful. In particular, many produce useful biological compounds, including medicines. Humanity is not in any position to turn these down, however strange the source.
The parasite resembles a short centipede, with long stringy mandibles. It will latch itself to an appendage and then insert its mandibles, seeking major veins or arteries. While one mandible feeds on it's hosts blood supply, the other secretes a mixture of steroids. As a result host animals are stronger, more aggressive, and more fertile, but have shortened lifespans. The parasites have become sought after as sources of the steroids they secrete, as well as experimented with as a means of augmenting soldiers.
Ghost cows have moist, translucent, ghostly white skin. The moisture, which their skin continuously secrets, is actually an antiseptic and antibiotic. The skin is relatively weak, tearing easily, but the trade off is virtual immunity to infection, as well as resistance to many parasites and diseases. A collaboration of enterprising individuals across the world are attempting to capture, tame, and raise these cows as a source of antibiotics.
Numb worms are large, snakelike leeches. They hunt by sneaking up on a target if it is still, or, if desperate, leaping at it if it is moving. Once they bite into an animal, they inject it with an anticoagulant and an anesthetic while sucking out as much blood as possible. With the bitten area rapidly numbed, the animal with struggle less, lessening the risk of it injuring the worm. Unlike leeches, numb worms do not attach themselves for as long as possible, instead voluntarily detaching once full. The potential for numb worms to be farmed as a source of anesthetic is being explored.