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Why are there more people with sickle cell disease in one part of the world than in other parts?
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Why are there more people with sickle cell disease in one part of the world than in other parts?

User DKSRathore
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A :-) Sickle cell disease occurs more often among people from parts of the world where malaria is or was common. It is believed that people who carry the sickle cell trait are less likely to have severe forms of malaria.
User Preckrasno
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