Marsh fever

Marsh fever, also known as sallar or typhus, was one of the Five Fevers of Faerûn.

In Cormyr, the disease was most associated with Marsember, and so was sometimes called Marsembian marsh fever or Marsember Pox.

Acquisition
Marsh fever was spread from contagious vermin to mammals by injury, usually via a bite or scratch. Otyughs were also said to be highly likely to be infected with the disease, and could spread it via their bites. Symptoms would begin to manifest within three to eighteen days from the point of exposure.

Effects
Marsh fever caused fever and a steady and fairly fast decline in stamina and fortitude. Marsembian citizens who were believed to be infected with marsh fever displayed pale skin, bouts of coughing, and unexplained spitting. While a healthy individual could recover naturally from the disease, marsh fever could be fatal.

History
As of the mid–14 century DR, most Cormyrean nobility refused to travel to Marsember out of a (not entirely accurate) belief that the city was always gripped by an epidemic of marsh fever, and there were rumors that both the Aurubaen and Janthrin families had died out owing to marsh fever. Regardless of the truth, it was generally the case that "marsh fever" was an overused and generally inaccurate term for describing the general conditions in Marsember.

As of the mid-to-late 14 century DR, it was estimated that 1 in every 50 vermin in Faerûn was infected with marsh fever.