Diseases

When a character is injured by a contaminated attack (such as a mummy’s slam attack, which can transmit mummy rot), touches an item smeared with diseased matter, or consumes disease- tainted food or drink, he must make an immediate Fortitude saving throw. If he succeeds, the disease has no effect—his immune system fought off the infection. If he fails, he takes damage after an incubation period. Once per day afterward, he must make a successful Fortitude saving throw to avoid repeated damage. Two successful saving throws in a row indicate that he has fought off the disease and recovers, taking no more damage.
You can roll these Fortitude saving throws for the player so that he doesn’t know whether the disease has taken hold.

Name	Infection	DC	Incubation	Damage	Source
Ghoul Fever	Injury (Bite)	12	1 day	1d3 con, 1d3 dex	MM1
Blinding sickness	Ingested	16	1d3 days	1d4 Str1	DMG
Cackle fever	Inhaled	16	1 day	1d6 Wis	DMG
Demon fever	Injury	18	1 day	1d6 Con2	DMG
Devil chills3	Injury	14	1d4 days	1d4 Str	DMG
Filth fever	Injury	12	1d3 days	1d3 Dex, 1d3 Con	DMG
Mindfire	Inhaled	12	1 day	1d4 Int	DMG
Mummy rot4	Contact	20	1 day	1d6 Con	DMG
Red ache	Injury	15	1d3 days	1d6 Str	DMG
Shakes	Contact	13	1 day	1d8 Dex	DMG
Slimy doom	Contact	14	1 day	1d4 Con2	DMG

1 Each time the victim takes 2 or more damage from the disease, he must make another Fortitude save or be permanently blinded.
2 When damaged, character must succeed on another saving throw or 1 point of damage is permanent drain instead.
3 The victim must make three successful Fortitude saving throws in a row to recover from devil chills.
4 Successful saves do not allow the character to recover. Only magical healing can save the character.