Parasite Rex by Carl Zimmer offers a fascinating glimpse into the world of real-world parasites and demonstrates how truth can sometimes be scarier than fiction. Among other things it served as the inspiration for Scott Westerfeld's novel, Peeps, which is also not a bad source for an Infected campaign.
Animal Planet's Monsters Inside Me is about the first-person accounts of doctors and patients who had to deal with exotic parasites.

Discovery Health as a whole is able to give a good many ideas on unknown diseases and viral infections that plague the human race.

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