Rare Disease Research Challenges and Innovations What is a rare disease?
A rare disease, also known as an orphan disease, is a medical condition that affects a small number of people. In most countries, a disease is considered rare when it affects fewer than 1 in 2,000 individuals. However, this definition may vary from country to country.
Rare diseases can be genetic, meaning they are caused by an alteration or mutation in a person's...
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