The interval between the flu vaccine and the quadrivalent HPV vaccine is recommended to be greater than half a month. Influenza vaccine is mainly used for the prevention of influenza, while quadrivalent HPV vaccine is used for the prevention of HPV infection and cervical cancer, and the two vaccines cannot be injected at the same time. After the injection of a vaccine, you need to wait for the body to react and produce the corresponding antibody, and at the same time, you need to observe the adverse reactions after the vaccine injection, so it is recommended that the interval between the two vaccines should be more than half a month or more, so as not to affect the effect of the vaccine and to increase the adverse reactions to the vaccine. You can choose whether to receive the flu vaccine or the quadrivalent HPV vaccine first according to your own situation. It should be noted that during the acute stage of the disease, people who are allergic to vaccine components are not recommended to receive the vaccine.