Human papillomaviruses (HPVs) are small DNA viruses which exhibit tropism for cutaneous or mucosal epithelium. Commonly categorized as either low-or high-risk HPV types on the basis of their oncogenic potential, infections with the high-risk HPV types such as HPV-16 and HPV-18 have been implicated in cervical-anogenital cancer and oral squamous cell carcinomas (41). The mucosal lesions caused by HPVs often resolve over time, and a high percentage of young women exposed to HPV clear the infection within a short period following initial contact with the virus (62). Empirical evidence for the critical role the immune response plays in controlling an HPV infection comes from the high prevalence and persistence of HPV infections in immunosuppressed individuals (62). In general, the mucosal immune response to an infection begins with the cells of the epidermis secreting alarm signals which act on immune cells as well as the infected cells.