thalassaemia trait BrE
thalassemia trait AmE

For example, HbS homozygotes who also inherit α thalassaemia trait typically have higher haemoglobin levels and a less severe clinical picture.

Several genetic factors provide some resistance to it including sickle cell trait, thalassaemia traits, glucose-6-phosphate dehydrogenase deficiency, and the absence of Duffy antigens on red blood cells.