Cervical cancer vaccine is suitable for people: 1. Age: In past studies, it was generally believed that the vaccine could not provide antibody protection to people over 26 years of age. The Hong Kong Department of Health believes that the quadrivalent vaccine has been confirmed through large clinical studies to provide ideal protection for women aged 24-45, and therefore relaxed the age of application of the quadrivalent vaccine from 9-25 years to 9-45 years in 2010. However, it is recommended that vaccination be given before it is too late, as the most appropriate age for vaccination is 11-12 years old.2. Gender: In addition to cervical cancer, HPV can also cause genital warts, so both men and women are at risk. In addition, men may also infect their partners with HPV and develop cancer or warts, so men who receive the HPV vaccine will also benefit their partners indirectly. 3. Sexual behavior: The effect of the cervical cancer vaccine will be reduced for women who have already had sex. Because they may have been or are infected with HPV and the vaccine has no therapeutic effect, vaccination is relatively meaningless. However, some studies suggest that women may have only been previously infected with one of the HPV viruses, so for women who have had sex, they can still receive some level of protection through the vaccine. Some studies have shown that women are most effective when vaccinated around the time of menarche.