More references, now for Paravirus. Tae is a biology student just trying to get by until Hirudi, a man made parasite, takes up residence in his body. The basic plot would be a monster of the week format- Hirudi reveals the lab he came from has engineered other parasites, which have escaped and infected other people.
The idea for Paravirus came from a dream. In the original dream, I had come across people talking about an old DS game, a bit of a cult classic. It was styled like Bowser's Inside Story, you were on the inside controlling Hirudi (who looked more like a black drippy blob with eyes). They would start out pretty uncaring for the body, wreaking general but not fatal havoc, since they were living there. But at a certain point they'd discover another parasite, their sibling, who was much more deadly and set on world domination. So the rest of the game involved Hirudi contacting Tae through his nervous system and working together to defeat their sibling.
The plot and characters have certainly changed now, but the bones of the dream are still there.