Influenza is prone to epidemics and outbreaks in winter and spring, so the influenza vaccination is usually chosen in September and October. Early vaccination can greatly prevent the occurrence of influenza. Currently, the influenza vaccine consists of 3 types of viruses: A, B and C. It is used to prevent influenza caused by the influenza virus. Due to the rapid change of temperature in spring and winter, people with low immunity are easily attacked by viruses, resulting in colds. Therefore, getting the flu vaccine in September or October before the onset of the winter and spring seasons is an important way to prevent the flu and reduce the chances of contracting the flu or alleviate its symptoms. Before receiving the vaccine, it is important to ask about any history of allergies, such as an allergy to eggs or to certain ingredients within the vaccine, and these people should not receive the flu vaccine. Also, if you have a cold, fever or a rash, it is not appropriate to vaccinate during the acute phase of the illness, and you should wait until you recover from the illness before getting vaccinated.