In our communication [1] on the prenatal transmission of human herpesvirus 6 (HHV-6), we would have discussed the novel mode of herpes virus transmission suggested by Daibata et al. [2] (i.e., transmission via parental germ line DNA containing integrated viral DNA). This was not possible because both papers appeared in print at the same time. In retrospect, we would have entertained this possibility with enthusiasm if the authors [2, 3] had also shown the chromosomal association of HHV-6 DNA in tissues other than lymphocytes.