Virginia was the first state in the nation to require that kids entering the sixth grade be vaccinated against human papilloma -- a virus that causes cervical, oral, throat and other cancers.  Parents can opt out of that requirement, and  many of them do.  Virginia ranks 44th in the nation when it comes to HPV vaccination.  A team of nurses at the University of Virginia is looking at that problem and making recommendations. Some parents think it’s unnecessary, since HPV is sexually transmitted, but Assistant Nursing Professors Emma Mitchell and Jessica Keim-Malpass sa...