Later, if the person encounters that germ again, their immune system can “recognize” it and “remember” how to fight it off. The body’s immune system develops antibodies that fight that particular germ and keep the person from getting sick from it. A vaccine introduces a less harmful part of that germ - or something created to look or behave like it - into a person’s body. Vaccines help people develop immunity to a virus or other germ. Lisa Maragakis, M.D., M.P.H., senior director of infection prevention, and Gabor Kelen, M.D., director of Johns Hopkins Office of Critical Event Preparedness and Response, address common questions and explain how a vaccine could affect the current pandemic.ĬOVID-19 Vaccines and How They Work How do vaccines work? Food and Drug Administration (FDA) has authorized use of vaccines for the coronavirus that causes COVID-19.
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