Lt. Gen. Jody Daniels, Chief of Army Reserve and Commanding General, U.S. Army Reserve Command, greets Gen. Michael X. Garrett, Commanding General, U.S. Army Forces Command, at the Womack Army Medical Center before their appointment to receive the first injection of the COVID-19 vaccine at Fort Bragg, North Carolina, Jan. 11, 2021. The Pfizer and Moderna vaccines work by using transient information carrying molecules (mRNA) to teach our cells to make a protein that triggers antibody formation to create an immune response in our bodies. The mRNA is synthetic, not extracted from actual viruses, and it does not enter or interact with your body’s own DNA. The COVID-19 vaccine consists of two doses administered about 21-28 days apart.