Gardasil shows POTENTIAL to prevent SOME cervical cancer. There are more than 30 types of HPV which can cause cancer and for those women—firstly, who receive Gardasil; secondly, who receive Gardasil before being infected; and thirdly, whose protection by Gardasil is still active and effective [uncertainty prevails on this point]—there is protection against 4 of the most common types which together cause about 70 per cent of cervical cancers. When all is factored in, some believe the vaccine MAY help to prevent less than 17% of cervical cancers.
Read Vote Life, Canada's excellent post.
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