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J Infect Dis. 2008 Jan 15;197(2):262-5. doi: 10.1086/524691.

Genetic deficiency of chemokine receptor CCR5 is a strong risk factor for symptomatic West Nile virus infection: a meta-analysis of 4 cohorts in the US epidemic.

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  • 1Molecular Signaling Section, Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Abstract

West Nile virus (WNV) causes disease in approximately 20% of infected humans. We previously reported that homozygosity for CCR5Delta32, a nonfunctional variant of chemokine receptor CCR5, is markedly increased among symptomatic WNV-seropositive patients from Arizona and Colorado. To confirm this, we analyzed cohorts from California and Illinois. An increase in CCR5-deficient subjects was found in both (for California, odds ratio [OR], 4.2 [95% confidence interval {CI}, 1.5-11.9] [P= .004]; for Illinois, OR, 3.1 [95% CI, 0.9-11.2] [P= .06]). A meta-analysis of all 4 cohorts showed an OR of 4.2 (95% CI, 2.1-8.3 [P= .0001]). Thus, CCR5 deficiency is a strong and consistent risk factor for symptomatic WNV infection in the United States.

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