28 February is known as Rare Disease Day for raising awareness and generating change for the 300 million people worldwide living with a rare disease, their families and carers. In the United States, a disease is considered “rare” if it affects fewer than 200,000 individuals. More than 7,000 diseases fit the bill, and all told, between 25 and 30 million Americans are living with a rare disease. The majority of these diseases are genetic. 
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