A nurse in a family practice office routinely reviews clients' immunization status at their annual physical examination visits. For which of the following clients should the nurse recommend a human papillomavirus immunization?

A. A teenage boy is the correct answer. The HPV vaccine is recommended for males and females starting at age 11 or 12, but it is most effective when given before any sexual activity. The vaccine can be administered through age 26 for individuals who were not vaccinated at the appropriate age. B. An older adult woman is not typically recommended for the HPV vaccine. The vaccine is most effective when given before exposure to the virus, typically in preadolescent girls and boys. Women over the age of 26 may not benefit as much from the vaccine. C. A preschool-age girl is unlikely to receive the HPV vaccine at this age, as it is usually given starting at age 11 or 12, ideally before the onset of sexual activity. D. A middle adult man may still receive the HPV vaccine if not previously vaccinated, but it is primarily recommended for individuals under age 26.