RHD and rheumatic heart disease: Similarly, analysis for Toxoplasma-free subjects showed no significant effect of RhD phenotype, while this analysis for Toxoplasma-infected subjects revealed a 0.38 times lower risk of traffic accidents in RhD-positive than in RhD-negative subjects (CI95: 0.177–0.84, t = -2.39, P = 0.017).