The first time you contract the disease, a turns-to-live timer is started, set to between 20 and (19+Con). Each additional disease attack while you are
Ill divides the remaining turns-to-live by roughly 3.
Disease is fatal, unless cured by a unicorn horn, a blessed potion of healing or blessed/noncursed potion of extra healing/full healing, the spell of cure sickness, an eucalyptus leaf, prayer, the Staff of Aesculapius, polymorphing into a new version of yourself or a sickness-resistant monster, a nurse's healing attack, a throne (1/13 Chance), or, if non-chaotic, holy water.
- Food poisoning - this is basically the same thing by another name