See below : HPV vaccines fall into 2 broad categories: preventive and therapeutic. Preventive vaccines prevent infection with the virus and therapeutic vaccines treat the infection, the precancerous changes, or the cancer in individuals who are already infected. There are currently several therapeutic vaccines in Phase 2 (and possibly early Phase 3) trials against HPV-16 and 18 which cause most cervical Ca.
Answered 5/30/2016
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