Q:  If the vaccines causes symptoms, doesn’t that mean it is harming the body?

The purpose of the vaccine is to allow the immune system advanced sampling of the proteins of the virus so that antibodies and other immune cells can be prepared for when the real virus infects the body and it can quickly neutralize it.  The immune system uses chemical messages to signal to cells that are part of this system to reproduce and make the necessary antibodies.  These messengers, such as interferon, can make you feel like you have the flu.  Fortunately, this does not last long and usually goes completely away after a few days.  It is not harming the body.

Response by Roger Seheult, MD, Associate Clinical Professor at the University of California, Riverside School of Medicine and  Assistant Clinical Professor at the School of Medicine and Allied Health at Loma Linda University