How is the body's reaction to a vaccine similar to its reaction when it is attacked by a virus?

Answer 1

When you are given a vaccine, you are actually still given the virus. However, it may only be certain parts of the virus, or it might be dead, or it might be genetically changed so it can't replicate very quickly.

All this means is that the body see the virus and responds as it normally would- hunting it down, killing it and making antibodies and memory cells against it (which is what gives you future protection). The only difference is that the virus won't make you sick because of the above alterations.

Any symptoms you experience from a vaccine are purely due to your bodies response, not the virus- eg sore arm is due to immune cells clustering at the area, a fever is there to slow viral replication.

Answer 2

When a vaccine is created, there may be some of the virus actually in it, but weakened or killed or something similar to that. Your body may contract it, but in a less severe form.

Answer 3

The bodies response to a viral infection will only be the same as a vaccine that is a live viral vaccine. The live virus induces an adaptive cell mediated immune response (CMI) than involves T-cells (CMI) instead of B-cell response(humoral)

Answer 4

a vaccine its a desactivated virus, it contains just some parts of it, like the envelope, and in some cases antigenic intracelular proteins .
All of them activates the citotoxic t cell response and the plasmatic cell response under the direction of the T helper cell.