which are caused by the human pap loama virus. the reality is the more we looked at it it's not just about preventing serve call cancer but a series of other cancers. >> people have been focussed on the fact that it is a sexually transmitted disease. it's a reason parents don't get their kids vaccinated. if you don't get the vaccinated when they are younger, when they are exposed when they are older, it's not effective. the vaccine is a teaching tool. it can prevent cervical cancer oral penile cancers. a whole host. >> i hate to reduce this to a marketing issue, is that the problem, this has been marketed to an s.t.d. as opposed to a cancer vaccine. >> that's part of it. in australia they have a better vaccination rate of 80%. i think that's because they are focus on the fact that it can protect your child from cancer. it's not 100% effective, it doesn't totally prevent from cancer but is 30-90% effective. >> how sure are we that this could prevent mouth, throat and other cancers. >> we are not sure. the way the studies have been