Influenza refers to the common cold, and influenza vaccine refers to the cracked influenza virus vaccine. Patients who have recovered from influenza also need to be vaccinated with the cracked influenza virus vaccine to prevent recurrence of influenza. Influenza is an acute respiratory infectious disease that can be spread by respiratory droplet transmission, direct or indirect contact, and is highly contagious and universally susceptible. For patients who have recovered from influenza, it is usually necessary to receive a split-virus influenza vaccine, which encourages the body to develop immunity against influenza cold viruses and prevents the body from getting influenza again. Some people may have adverse reactions such as pain, redness, swelling and itching at the injection site after receiving the split flu virus vaccine, which usually do not require treatment and may subside on their own. If it is clear that you are allergic to the vaccine components, suffering from acute or severe chronic diseases, in the acute exacerbation of chronic diseases, fever, pregnant women and other special groups, then it is contraindicated to receive influenza virus lysate vaccine. It is recommended that those in need of the vaccine should consult regular hospitals to receive the fissured influenza virus vaccine, and pay attention to strengthening the skin care of the injection site after vaccination to avoid irritation by friction with foreign objects.