Influenza A will appear the possibility of secondary infection. Influenza A that is influenza A H1N1, belongs to an acute respiratory infectious diseases, mainly through the droplets through the respiratory tract transmission, influenza A in the cure will not play a lifelong immunity, and the virus is very likely to mutate, so the body produces antibodies can only be a type of influenza A have a role, there will still be the possibility of secondary infection. Influenza A often occurs in the winter and spring seasons, can cause large-scale outbreaks and infections, therefore, daily to do a good job of self-protection of the body, usually strengthen the exercise and nutrition, maintain adequate sleep, improve their own immunity, to avoid catching a cold, avoid going to crowded places, and regular vaccination every year.