HBB and sickle cell disease: The wild-type HbB-A/A genotype was present in 80.5% of children; the sickle cell genotypes (SCT, HbS-A/S, or HbC-A/C) in 18.6%, and homozygous variant genotypes associated with sickle cell disease – (SCD, S/S, S/C or C/C) in 0.9% of the children.