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Proportions of seropositive subjects for different categories of plasma vitamin C concentrations. The Finnish (n = 194) and Russian (n = 237) subjects with levels of serum IgG antibodies to A. actinomycetemcomitans and P. gingivalis of ≥5.0 EU as determined by a multiserotype ELISA were classified as seropositive for the pathogen. The proportion of seropositive subjects was calculated separately for each vitamin C category.
