An ultra-rare disease is a disease that affects an extremely small percentage of the population. In some parts of the world, an ultra-orphan disease is a rare disease whose rarity means there is a lack of a market large enough to have support and resources for discovering treatments for it.
An ultra-rare disease is a disease that affects an extremely small percentage of the population. In some parts of the world, an ultra-orphan disease is a rare disease whose rarity means there is a lack of a market large enough to have support and resources for discovering treatments for it.
Source: Wikipedia "Ultra-rare disease" · CC BY-SA 4.0
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