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WJLA, February 29, 2012

Rare Disease Day: 10 rare diseases and their symptoms

A disease is considered rare if it affects less than 200,000 Americans. According to NIH, there are 6,800 such diseases affecting nearly 30 million people. Feb. 29 is Rare Disease Day, which aims to increase awareness about these conditions. 

Gracie Van Brunt, a singer-songwriter from Boston, Mass., has Shwachman–Diamond syndrome, which is characterized by the inability to properly digest food due to a lack of digestive enzymes, bone marrow dysfunction and short stature.