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Correlation between ex vivo IFN-γ ELISPOT responses at DDM+7 and days to parasitemia for group 1 (DDM-ME TRAP). The summed ex vivo IFN-γ ELISPOT response to ME TRAP 7 days after the final vaccination (DDM+7) for each group 1 subject correlates with the number of days to parasitemia as measured by Spearman's rank correlation coefficient (r = 0.793, two tailed, P = 0.033). One subject had been excluded from all immunogenicity analysis because of a very high background at one time point.
