Vivorbos

A disease that a person could contract by being bitten by the Harlingfly. The disease in undetectable until the smitten dies, or is otherwise rendered brain-dead, and will meer days after the death of the brain, take control of the most basic parts of the brain, in order to reanimate the decaying feeble body of the diseased so that the disease once again can be transmitted to another body, through the exchange of bodily fluids.

As previously mentioned however the person who has been reanimated will a couple of days after brain-death be in a state of decay rendering it virtually impossible for the smitten, to be of any significant danger to others.