From their announcement:
Irrational Number Line Games has their final Halloween themed Idea of the Week, a genre-independent werewolf and vampire supplement up for free at Wargame Vault. Yes, more vamps and wolvies … but its short, free and (we hope) different enough to poke a little fun into your game.
Since the Anne Rice's The Vampire Lestat came out our group has been futzing with the idea of vampirism and lycanthropy as regular diseases as opposed to occult happenings (which the Vampire Chronicles gravitated back to). It has been a fun exercise, and the result is this two-pager (with sample tracking charts) that gives a genre-independent method for implementing a non-run-of-the-mill bout of vampirism or lycanthropy for your campaign. Instant infection and transformation is a ton of fun in From Dusk Til Dawn, but this material is designed to lurk beneath the skin of your campaign to torture your players.
A few (geez … almost fifteen) years of playtesting has seen this approach be born completely unfit, bloat up to several dozen pages, then refine back down to a couple of pages of broken in and usable guidelines. Enjoy!
And if you don't like it … bite me! :)