<prompt> Which is the most common agent responsible for Ca cervix?HPV 16HPV 18HPV 31HPV 33  <response>: HPV 16 is responsible for about 50 of cervical cancer, and is the most common agent responsible for carcinoma cervix. Other HPV strains associated with cervical cancer are HPV 18, 31 and 45. Ref: Textbook of gynecology by D C Dutta 4th edition Page 316, 322; ALCAMOSS fundamentals of microbiology By Jeffrey C Pommerville page 829; Johns Hopkins Manual of Gynecology and Obstetrics, The, 3rd Edition, chapter 41. 