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Logistic regression model of the probability of neurocognitive impairment (NCI) by latent Toxoplasma infection (LTI) status and CD4+ T-cell counts. While risk of NCI decreases with higher CD4+ T-cell counts in LTI-negative (LTI–) persons (blue crosses), the opposite effect is found in LTI-positive (LTI+) persons (red dots). At CD4+ T-cell counts near 200 cells/µL, the levels of risk converge.
