“…It has been known for some time that HPV lesions (warts and EV) are common in patients with impaired immunity, either primary immunodefi ciency or a secondary one due to organ transplantation for example [3,6,9,16,22,24,26], thus suggesting immunological mechanisms to play a crucial role in wart rejection [1,2, 1 1, 13, 17, 18,21,32-34], Indeed, both humoral (specific antibodies) [18,21,23,27,36] and cell-mediated immunity (CMI) [2,5,6,10,11,14,15,17,18,20,21,34,36,37] have been disclosed against the different types of HPV lesions. According to current understand ing, the impairment of CMI seems to be the main factor of predisposal for the development of HPV infection, the susceptibility with particular HPV type being related to the magnitude of the CMI defect [11].…”