Random Disease Generator

Chance of Infection = Checked every time an individual is exposed to the disease (interacting with an infected person, drinking or swimming in contaminated water, traveling through a region with carrier pests, etc).
Chance of Immunity = Only checked once per person, when they are first exposed to the disease. If they are immune, the disease will never affect them.
Chance of Fatality = Only applies if the disease goes untreated. Check for fatality around halfway through the duration. Note that most diseases are completely treatable by modern medicine. In a fantasy or historical setting, there may be special herbs that work just as well.
Symptoms = Only major symptoms are listed. Minor ones like aches and pains, congestion, and malaise can be assumed as appropriate.

The severity of the disease (duration and chance of fatality) can be increased by various factors such as lack of rest, lack of clean water, overcrowding, etc.

Result

Roll on "Name1" Roll on "Name2"
Transmission: Roll on "Transmission"
Incubation: Resolve: {1|2|1d4|1d6|2d4} days, Duration: Roll d6dResolve: {4|6|8|10|12} days.
Chance of Infection: Roll d20*5%, Immunity: Resolve: {1-3?Roll d20%|4?0%}, Fatality: Roll d20%.
Effects: Resolve: {10|25|50|75}% HP reduction. Symptoms: Fever, Roll on "Symptoms" d4 times (unique results only).
Notes: Resolve: {Roll on "Notes_Treatment"|} Resolve: {Roll on "Notes_Immunity"|} Resolve: {Those with immunity to the disease can still carry and spread it for a period of time equal to half the normal duration.|Symptoms subside partway through the duration, then return after 1d{4|6|8|10|12} days.|} Resolve: {1?Roll d20*5% chance of Roll on "Notes_Permanent"{, even if treated.|, unless treated.}|2-6?}

Subcharts

Name1 (d20)

d20	Result
1	Swamp
2	Black
3	Bloody
4	Gray
5	Camp
6	Cold
7	Ship
8	Yellow
9	Putrid
10	Scarlet
11	Billious
12	Scroffular
13	Wandering
14	Prison
15	Membranous
16	Septic
17	Undulant
18	Brittle
19	Horrid
20	Dry

Name2 (d17)

d17	Result
1	Rot
2	Lung
3	Consumption
4	Plague
5	Fever
6	Chills
7	Pox
8	Croupe
9	Flu
10	Wasting
11	Flux
12	Touch
13	Ague
14	Throat
15	Edema
16	Fits
17	Toxicosis

Symptoms (d12)

d12	Result
1-2	weakness
3	paralysis
4	blindness
5	confusion
6	dizzyness
7	boils
8-9	cough
10-11	diarrhea
12	convulsions

Notes_Treatment (d4)

d4	Result
1	No known treatment.
2	Treatment only halves chance of fatality at best.
3	Treatment requires rare/expensive medicine.
4	Disease lasts for the duration or until it's treated, whichever is longer.

Notes_Immunity (d3)

d3	Result
1	Survivors gain permanent immunity.
2	Relapse every Resolve: {1\|2\|1d4\|1d6} years, Resolve: {just as severe as the first time.\|halved duration and chance of fatality.}
3	Once someone survives the disease, it will never be fatal for them, though they can still contract it.

Transmission (d3)

d3	Result
1	Communicable (Resolve: {Close Contact\|Intimate Contact\|Airborne}). Spread by Resolve: {pests\|filth\|contaminated water\|animals\|dead bodies}. Resolve: {{Warm\|Cold} seasons only.\|\|}
2	Spread by Resolve: {pests\|filth\|contaminated water\|animals\|dead bodies}. Resolve: {{Warm\|Cold} seasons only.\|\|}
3	Communicable (Resolve: {Close Contact\|Intimate Contact\|Airborne}). Resolve: {{Warm\|Cold} seasons only.\|\|}

Notes_Permanent (d8)

d8	Result
1	permanent loss of strength
2	permanent memory loss
3	permanent scars
4	permanent skin discoloration
5	permanent loss of mobility
6	permanent blindness
7-8	permanent loss of constitution

generic sickness systemless

d3	Result
1	Communicable (Resolve: {Close Contact\|Intimate Contact\|Airborne}). Spread by Resolve: {pests\|filth\|contaminated water\|animals\|dead bodies}. Resolve: {{Warm\|Cold} seasons only.\|\|}
2	Spread by Resolve: {pests\|filth\|contaminated water\|animals\|dead bodies}. Resolve: {{Warm\|Cold} seasons only.\|\|}
3	Communicable (Resolve: {Close Contact\|Intimate Contact\|Airborne}). Resolve: {{Warm\|Cold} seasons only.\|\|}