Blacktongue

Blacktongue was a well-known disease in Faerûn, and was one of the so-called Five Fevers.

Acquisition
Blacktongue was transmissible through ingesting the disease. Symptoms manifested within four days.

Effects
Sufferers of blacktongue experienced fever and a steady loss of their mobility and reflexes. While a healthy individual could fight off the disease in a matter of days, blacktongue could ultimately be fatal as the sufferer's tongue turned black and swelled to fill their mouth.