This video provides an overview of how a virus spreads, invades the body’s cells, and results in symptoms, as well as how a vaccine works to use the body’s natural immune response to protect us from these germs. Specific attention is paid to the unique aspects of the COVID-19 virus, the mRNA vaccine, the vaccine variations and boosters that are a source of confusion. This video is part of our Supporting Vaccination Toolkit for Community Health Workers (CHWs). This free digital toolkit is designed to increase the self-efficacy and effectiveness of CHWs in conducting vaccine outreach in communities, ultimately increasing vaccination rates.