Tuberculosis

Tuberculosis is an extended respiratory infection that wreaks havoc on the lungs, causing intense coughing fits that can eventually lead to death.
Resisting the Disease. A creature afflicted with tuberculosis makes a Constitution Saving Throw against their affliction level at the end of every 7 days after contracting the disease.

• Major Success: The creature's affliction level decreases by 1.
• Success: The creature's affliction level remains the same.
• Failure: The creature's affliction level increases by 1.
• Major Failure: The creature's affliction level increases by 2.

Transmission. After onset, an afflicted creature is contagious. Whenever the creaturue coughs, any humanoids within 10 feet of the creature must make a DC 10 Constitution Saving Throw or be Afflicted 5 with tuberculosis.

Disease Symptoms

Stage (Affliction Level)	Effects
Cured (<1)	The disease ends.
Onset (1-10)	The creature has a persisent cough and mild chest pain.
Stage 1 (11-20)	As above, but the cough is more pronounced and the creature's Suffocation Limit is halved as they have trouble breathing. The creature has disadvantage on Constitution Checks and Saving Throws. Whenever the creature attempts to speak loudly or cast a spell with verbal components, the creature must make a DC 10 Constitution Saving Throw or spend their action suffering a fit of coughing. If this coughing occurs when casting a spell, the spell is wasted.
Stage 2 (21-30)	All effects of prior stage, but the DC to resist a fit of coughing is 15. Any time the creature suffers a fit of coughing, they cough up blood and take 1d6 necrotic damage.
Stage 3 (>31)	All effects of prior stage. Any time the creature makes a Strength or Dexterity Check, it must make a Constitution Saving Throw or suffer a fit of coughing.