New! Explainer: How COVID-19 Vaccines Work

Many vaccines are currently being tested as a tool to combat the COVID-19 pandemic. A new fact sheet developed by Immunize Colorado explains the key differences and similarities between the three vaccines approved for Emergency Use Authorization (EUA) by the Food and Drug Administration (FDA) in the U.S. as of March 15, 2021: the Pfizer vaccine, the Moderna vaccine, and the Johnson & Johnson (Janssen) vaccine. The fact sheet describes how each kind of vaccine (mRNA and viral vector) works in the body to build immunity, explains the differences in dosing, and highlights all three vaccines’ ability to prevent nearly 100% of COVID-19 hospitalizations and deaths.