Most of the quadrivalent influenza vaccines cost around $150, and the charges may vary slightly depending on the region, so it is recommended to consult with your local medical institution. Quadrivalent influenza vaccine belongs to the second category of national vaccines need to be self-funded vaccination, regional and vaccine manufacturers are different, the price will be slightly different, most of them are about 150 yuan, the actual hospital charges shall prevail. In some areas, free vaccination is available for special populations. For details, consult your local CDC department. Quadrivalent influenza vaccine can prevent four types of influenza viruses (two subtypes of influenza A virus and two subtypes of influenza B virus), can effectively prevent influenza caused by four types of influenza viruses, and reduce the risk of serious complications and death. Age ≥3 years old can be vaccinated in consultation with a healthcare professional if there are no relevant contraindications.