How much do you know about influenza vaccination?

At present, the novel coronavirus pneumonia epidemic situation in

is still grim. China’s overseas input risk persists. With autumn and winter approaching, influenza will also usher in a high incidence period, and the demand for influenza vaccination has increased compared with the same period in previous years. Which groups need to be vaccinated? Did they vaccinate last year, and will they be re vaccinated this year? Wang Jin, chief physician of the immunization program Institute of Sichuan Provincial Center for Disease Control and prevention, explained the “hot spot” of influenza vaccine. There are trivalent inactivated influenza vaccine and Tetravalent Inactivated Influenza vaccine approved for marketing in China, iiv3 includes split vaccine and subunit vaccine, and iiv4 is split vaccine. Annual influenza vaccination is an effective means to prevent influenza, which can significantly reduce the risk of influenza and serious complications. < p > < p > due to the general susceptibility of the whole population to influenza, the high-risk groups such as pregnant women, infants, the elderly and patients with chronic diseases are more serious after being infected with influenza. Therefore, all people with no contraindications at the age of 6 months can be vaccinated with influenza vaccine. < p > < p > in order to reduce the risk of influenza and severe clinical outcomes in high-risk groups, it is recommended that children aged 6 months to 5 years, people aged 60 years and above, patients with chronic diseases, medical staff, family members and caregivers of infants under 6 months of age should be given priority. < / P > < p > first, the immunity acquired by human body infected with influenza virus or vaccinated with influenza vaccine will decline with time. The degree of attenuation is related to the age, physical condition, vaccine antigen and other factors. The evidence from clinical trials suggests that the protective effect of inactivated influenza vaccine against similar strains of antigenic virus can be maintained for 6-8 months. One year after inoculation, the serum antibody level decreased significantly, but the protective effect of some strains could last longer. < / P > < p > the second is that the antigenicity of influenza viruses is variable. In order to match the ever-changing influenza viruses, the influenza vaccine components recommended by who in most seasons will update one or more strains, and the vaccine strains are exactly the same as those in the previous season. Therefore, in order to ensure the maximum protection of the vaccinated population, even if the composition of the influenza vaccine is the same as that of the previous season, given that the antibody titer of most vaccinators has decreased significantly, it is still recommended to vaccinate before the coming of the current influenza season, regardless of whether the influenza vaccine was given in the previous season. 08/16/2020