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Mean absorbance values of nonresponders to each of the three Acanthamoeba serogroups. Each value is the mean ± SD for seven healthy individuals tested against serogroup 1 (A. astronyxis), serogroup 2 (A. polyphaga), or serogroup 3 (A. culbertsoni) antigens. Serum IgG from each individual was tested in triplicate against each serogroup by ELISA.
