This document provides an overview of COVID-19, including its background, mechanisms, prevention, and treatment. It discusses the timeline and evolution of COVID-19, as well as its pathogenesis and symptoms. Regarding prevention, it classifies and compares different vaccines, noting advantages of mRNA vaccines. For treatment, it discusses potential targets in the virus life cycle and candidate medicines like favipiravir and molnupiravir that inhibit COVID-19 replication.