Table 2. Duffy allele frequencies in Afro-descendant communities from Brazilian Amazon.

Region	N	Allele
		FY*A	FY*B	FY*B ES
Erepecuru river	391	0.352	0.272	0.376
Trombetas river	203	0.291	0.234	0.475
Overall	594	0.331	0.259	0.410