A new vaccine against the human papilloma virus (HPV), a sexually transmitted disease that causes most incidents of cervical cancer, is being opposed by religious conservatives in the US who claim it will "encourage promiscuity" in young women. According to Newscientist.com, half of all sexually active women in the US between the ages of 18 and 22 are infected with HPV and some of these cases go on to develop into cancer later in life. After successful trials of the vaccine, the US Centers for Disease Control and Protection recommended vaccination of all 11-12 year-olds. But so far only Virginia has passed a law requiring vaccination and West Virginia, Kentucky, Mississippi and New Mexico have rejected the program. In Texas, the Senate overturned the governor's order for the program to be introduced in that state.