Q218 is a designation used to refer to a specific variant of the COVID-19 virus, known as a subvariant of the Omicron strain. It emerged as part of ongoing mutations in the virus, which can affect its transmissibility and severity. Researchers monitor such variants to understand their impact on public health and vaccine effectiveness. The identification of Q218 is part of a broader effort to track the evolution of SARS-CoV-2, the virus responsible for COVID-19. Health organizations analyze these variants to inform guidelines and recommendations for vaccination and public health measures.