A prior infection with oral HSV-1 lowers the risk of acquiring genital HSV-1 even further. Studies show that genital HSV-1 infections almost always occur in people who have no prior infection with HSV of either type (Corey, Annals of Internal Medicine, 1983).
这段话说先前感染了一型口唇疱疹进一步降低了一型生殖器疱疹的感染风险。研究表明,感染一型生殖器疱疹的人几乎之前从未感染过任何类型的单纯疱疹病毒,(当然这个研究是1983年的了)。