There is a method in the world that can easily, effectively, and economically control infectious diseases, which is vaccination. April 25th is the "National Children's Vaccination Day". Experts from the Beijing Children's Hospital Health Center of the National Children's Medical Center pointed out that for children with special health conditions such as immune diseases and heart diseases, their underlying diseases are more likely to be infected with other diseases than healthy children, and infection may worsen or trigger underlying diseases. Therefore, such populations should take preventive vaccination measures to protect themselves. The immunization planning team for children with special health conditions at the Beijing Children's Hospital Health Center also pointed out that there is currently some vague understanding among parents regarding the vaccination of children with special health conditions, and clear guidance is needed. It is not completely unnecessary to vaccinate the non immunization planned vaccines free of charge, such as hepatitis B vaccine, BCG vaccine, etc., and parents will have no objection to taking their children to vaccinate on time. Non immunization program vaccines are voluntary and require self funded vaccination. Although voluntary, it is not completely unnecessary to fight. It is recommended that parents choose to receive pneumonia vaccine, Haemophilus influenzae type B conjugate vaccine, pentavalent vaccine, rotavirus vaccine, enterovirus type 71 vaccine (commonly known as hand, foot and mouth vaccine), influenza vaccine, chickenpox vaccine, etc. based on the age and physical condition of their children. Fever after vaccination should be treated in a graded manner. Generally, children may experience fever within 1-2 days after vaccination, and it can subside on their own after 1-2 days. Whether antipyretic drugs are needed should be treated differently based on the degree of fever in the child. For children without a history of febrile seizures, if their fever and body temperature are below 38.5 ℃, they can first observe or physically cool down, allowing the child to rest more, drink more water, eat a light diet, and exercise less vigorously. If the fever temperature exceeds 38.5 ℃, children over 6 months can take either ibuprofen or acetaminophen orally; If a child is over 3 months and under 6 months old, they can only choose acetaminophen; If it is an infant under 3 months old, seek medical attention promptly after experiencing a fever. If children who have previously experienced febrile seizures experience fever, it is recommended to actively control their body temperature and control the high fever. In the case of physical cooling, if the body temperature exceeds 38 ℃, antipyretic drugs can be added. The time for a child to develop a fever after receiving the vaccine usually does not exceed 48 hours. If it exceeds 48 hours or there is a trend of gradually increasing body temperature, it may be coupled with other infections. The child should be promptly taken to the hospital for treatment to avoid delaying the best time for disease treatment. It is really necessary to receive influenza vaccine every year, which is the most effective way to prevent influenza and can reduce the risk of influenza and serious complications for vaccinators. The surface antigen of influenza viruses is prone to mutation, resulting in new mutated strains. The World Health Organization determines the possible pandemic virus strains in the second year based on global monitoring results every year and provides targeted guidance for the preparation of influenza vaccines. Simply put, the flu vaccine may vary every year. In addition, the immunity generated by influenza vaccination will gradually weaken over time. Pregnant women, children aged 6 months to 5 years, as well as family members and caregivers of children under 6 months old, chronic disease patients, medical staff, etc., are vaccinated against influenza