Its reported on Aplastic Anemia and MDS International Foundation as 600-900 a year in the US. http://www.aamds.org/faq#t297n522 And another reports about 3 out of every 1 million people in the United States get aplastic anemia each year. The disease appears more often in eastern Asian countries, where it affects about 15 out of every 1 million people. http://bethematch.org/Patient/Disease_and_Treatment/About_Your_Disease/Aplastic_Anemia/Aplastic_Anemia_(Severe).aspx