How does a vaccine work? how does a vaccine work?

Answer and Explanation:

The person who answered before me is correct.

Vaccines train your immune system to recognize certain bad bacteriums, viruses, and other micro-organisms that can cause disease so they can (at least attempt to) fight it off.

When doctors inject these antigens into us, (which is something that induces an immune response in the body by producing antibodies) our immune systems can learn how to recognize these foreign, hostile invaders and fight them off.

Plus, if we get a certain disease again, these antigens will remember and most likely fight it off better than before.

~hope i helped and have a nice day.~

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.