Figure 2From: Association of Trypanosoma cruzi infection with risk factors and electrocardiographic abnormalities in northeast Mexico Distribution of Trypanosoma cruzi infection in Nuevo Leon, Mexico, by ELISA according to age (circles). Results of IHA were ≥ 1:32. Optical density results are shown as means ± 95% confidence intervals of a second-order polynomial regression, as indicated by the regression line and its 95% confidence area (dotted line).Back to article page