Lunacy was believed to be an affliction where the moon's face drove the weak-minded into fits of madness. Behavior associated with menstrual cycles also led to the idea of 'hysteria' or madness caused by internal organs. A village could be normal every time the adventurers pass through, but rumors might persist: a bare dozen travelers per year disappear on the road through this village.
Vibrio Vulnificus (and other Vibrio infections) are spread by the bites of reptiles such as alligators and would be attributed to poison or venom. The wound site turns black, green, or purple and swells. Skin near the wound develops pustules and boils, and the victim runs a high fever. Without treatment the limb might fall off -- but the time frame is long enough to spur a "save the fighter's arm!" side quest. Kobolds, dragonkin, drakes, and other reptiles could spread disease instead of generic 'poison damage' if they live somewhere particularly septic like a swamp. Go to Comment
A culture has a tradition of wearing animal pelts as a sign of status or job. Carpenters might wear beaver skins, Masons have a moleskin hood to their cloak, Gaurdsmen might have badger pelts. Done to show the culture's respect for nature and how much of nature is equal to each other.