Table III.

CCR5Δ32 homozygotes have increased risk of symptomatic WNV infection

	All racial groups			Self-reporting Caucasians
Cohort	OR	95% CI	P	OR	95% CI	P
Arizona	4.7	2.1–10.6	<0.0001	4.4	1.6–11.8	0.0013
Colorado	4.2	1.6–11.3	0.0018	9.1	3.4–24.8	<0.0001
Combined	4.5	2.2–9.4	<0.0001	5.9	2.7–13.2	<0.0001

Values were calculated in comparison to the CCR5Δ32 homozygous genotype frequency in 1,318 North American Caucasian random blood donors.