“…The viruses considered to be of high oncogenic potential include HPVs 16,18,31,33,35,39,45,51,55,56,58,59, 66 and 68 (5), and these have been associated with the development of various types of human neoplasias, particularly lesions of epithelial cells of the uterine cervix, urethra, anogenital region, skin, digestive tract, tracheal/bronchial and nasal mucosa and oral mucosa (6,7). DNA sequences of HPV 16 and 18 are found in approximately 85% of invasive squamous cell carcinomas and their precursors, such as grave dysplasia and carcinoma in situ.…”