RHD and bacterial infectious disease: The effects of age on four Cattell's personality factors, i.e. dominance (E), radicalism (Q1), self-sentiment integration (Q3), and ergic tension (Q4) and on Cloninger's factor reward dependency were stronger for RhD-negative than RhD-positive subjects and the effect of smoking on the number of viral and bacterial diseases was about three times stronger for RhD-negative than RhD-positive subjects.