Table 3: Allelic frequencies of ABO blood group in each group.

GroupAllelic frequencyHWE test value
ABO

CHIK seronegativity0.190.190.620.06
CHIK seropositivity0.180.180.640.38
(i) Asymptomatic infection0.170.190.640.71
(ii) Symptomatic infection0.190.170.630.12

HWE: the Hardy-Weinberg equilibrium.