What is the difference between thalassemia minor and major?

There are two forms of beta thalassemia. They are thalassemia minor and thalassemia major (which is also called Cooley's anemia).

Thalassemia minor: The individual with thalassemia minor has only one copy of the beta thalassemia gene (together with one perfectly normal beta-chain gene). The person is said to be heterozygous for beta thalassemia.

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Understanding Sickle Cell Anemia! by Dan Hammer

For the African-American community, sickle cell disease is a major health issue. Sickle cell disease can also affect Mediterranean, Middle Eastern, and Asian Indian ancestry, and there is a growing segment in the Latino-American population particularly those of Caribbean, Central American, and South American ancestry. In the United States one out of every 400 births has this disease. The most common type of sickle cell disease is sickle cell anemia.

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