RHD and cytomegalovirus infection: For CMV infection, the association with CMV infection was of similar strength but was non-significant (p = 0.071, partial eta2 = 0.164); however, significant associations were observed for the double interactions of sex–CMV (p = 0.002, partial eta2 = 0.223) and CMV–Rh (p = 0.022, partial eta2 = 0.185), as well as the triple interaction of sex–CMV–Rh (p = 0.002, partial eta2 = 0.223).