People infected at the end of last year still have effective antibody protection, and even if they are reinfected, the symptoms are generally mild. At present, whether it is a primary infection or a second infection, the proportion of severe disease is very low.
It is recommended that the elderly and other groups do a good job of personal protection and seek medical attention in time if infected. China has established a multi-channel monitoring and early warning mechanism, once the epidemic is found, local disease control departments will verify, assess, warn, and deal with it.