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Background . The objective of this study was to investigate the association of the ABO blood group phenotype and allele frequency with CHIK fever.  Methods . A rural community survey in Southern Thailand was conducted in August and September 2010. A total of 506 villagers were enrolled. Cases were defined as individuals having anti-CHIK IgG by hemagglutination ≥1 : 10.  Results . There were 314 cases (62.1%) with CHIK seropositivity. Females were less likely to have positive anti-CHIK IgG with odds ratio (OR) (95% CI) of 0.63 (0.43, 0.93). All samples tested were Rh positive. Distribution of CHIK seropositivity versus seronegativity ( P  value) in A, B, AB, and O blood groups was 80 versus 46 (0.003), 80 versus 48 (0.005), 24 versus 20 (0.55), and 130 versus 78 (<0.001), respectively. However, chi-square test between ABO and CHIK infection showed no statistical significance ( P  = 0.76). Comparison of the ABO blood group allele frequency between CHIK seropositivity and seronegativity was not statistically significant.  Conclusion . This finding demonstrated no association of the ABO blood group phenotypes and allele frequencies with CHIK infection.

Association of ABO Blood Group Phenotype and Allele Frequency with Chikungunya Fever