Francis Grimes believes that the vampires are responsible for the "Mad Larry Disease" outbreak in the city. He tells Mark Lilly that Johnny takes care of the bodies, including those of livestock, for the vampires. He works with Katrina and Hepcat Chet.
As it turns out, Johnny took a goat from the zoo to Blake's father as a snack. And Blake's father is actually doing a medical research on the cure for the disease.