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Negative predictive values (NPVs) and positive predictive values (PPVs) according to tularemia prevalence of ELISA-IgM (top)and ELISA-IgG (bottom) tests, using either the lower cutoff titers recommended by the manufacturer (dashed line) or the higher cutoff titers of 0.9 for IgM and 1.4 for IgG (solid line) defined herein to increase specificity.
