Children can postpone the vaccination against influenza because some children inevitably suffer from colds, bronchitis, acute enteritis and other symptoms, the children’s immunity is temporarily low and the organism shows signs of infection. If the A+C influenza vaccine is given to children hastily, it will cause the worsening of symptoms such as colds and coughs, and will also cause obvious adverse reactions, such as fever and abdominal pain, vomiting, diarrhea and other adverse reactions, and children may even have headaches and other symptoms of mild encephalitis. It is not too late to immunize children after the symptoms of colds and bronchitis have improved for a week or so.