The main source of infection seen in novel coronavirus pneumonia is pneumonia patients with novel coronavirus infection. The possibility of contamination of banknotes as a carrier is very small, and the chance of virus survival in banknotes is very small, so the possibility of transmission through banknotes is very low. People are advised to wear masks for protection when they go out, and to develop the habit of washing their hands regularly to avoid dirty hands touching their eyes, nose and mouth. For healthy people, the easiest and most effective way to protect themselves is to wear a mask and wash their hands regularly.