Immunizations

What is herd immunity and how can this help protect individuals who are not vaccinated? What are the rates for the State of Texas related to immunizations, and how could this affect herd immunity?
Today you have a patient on your schedule for the HPV vaccine. The patient is an eleven-year-old female whose mother is concerned and wants to discuss the vaccine further before consenting. She feels that by giving the child the vaccine she is giving her permission to be sexually active. What type of immunizations will you recommend and why?