Influenza vaccines are primarily used to prevent epidemic influenza. Currently, there are three types of influenza vaccines in our country: Type A, Type B, and Type C. The best time to vaccinate for influenza is in September and October, because epidemic influenza often outbreaks in winter and spring. Therefore, getting vaccinated during these months can greatly prevent the transmission of epidemic influenza. The main groups recommended for influenza vaccination include preschool children and the elderly or frail, such as those with chronic diseases. Those with chronic conditions are at high risk of exacerbating their diseases after contracting epidemic influenza. These groups are particularly suitable for influenza vaccination. During the influenza vaccination period and before getting vaccinated, it is important to ensure that one is not having a cold, including symptoms like fever, to proceed with the vaccination.