Research is being conducted on the epidemiology of reinfections, with studies examining the severity, characteristics, and risk factors associated with SARS-CoV-2 reinfections. The studies, which have been published in various medical journals, investigate reinfections in different locations, including Mexico City and Hong Kong. The research also explores the implications of reinfections for public health and the transition to endemicity, as well as the efficacy of natural immunity against reinfection.