How do COVID Vaccines work? Dr. Dan Kuebler breaks down the science of the currently available Pfizer, Moderna, and Johnson & Johnson COVID-19 vaccines. He explains how the vaccines work in the human body to protect it against the virus, as well as how researchers tested and created these vaccines using the HEK cell line. Finally, what does research data indicate about the safety and long term effects of these three vaccines? Dr. Kuebler outlines what we know from clinical trials and what we're still learning.