SARS-CoV-2 and Influenza Co-Circulation and Co-Vaccination: A Narrative Review

The concurrent circulation of SARS-CoV-2 and influenza viruses presents a growing public health challenge. Simultaneous and combination vaccination strategies have emerged as effective tools to streamline immunization, enhance protection, and reduce healthcare burden. Future studies should elucidate the mechanisms of the exacerbation of respiratory disease caused by co-infection, as well as the optimal strategies for co-administering influenza and COVID-19 vaccines for long-term control of seasonal and potentially pandemic respiratory viruses.