Question

How does a vaccine work?​

Answer 1

Vaccines are like a training course for the immune system. They prepare the body to fight disease without exposing it to disease symptoms. When foreign invaders such as bacteria or viruses enter the body, immune cells called lymphocytes respond by producing antibodies, which are protein molecules.

Answer 2

Answer:

Vaccines give you immunity to a disease without you getting sick first. They are made using killed or weakened versions of the disease-causing germ or parts of the germ (called antigens). For some vaccines, genetic engineering is used to make the antigens used in the vaccine. It’s much safer to get a vaccine than to get the disease it prevents.

Explanation:

When you get a vaccine, your immune system responds to the vaccine the same way it would to the real germ. It:

• Recognizes the germ in the vaccine as being foreign.
• Responds by making antibodies to the germ in the vaccine, just as it would for the real germ.
• Remembers the germ and how to destroy it. That way if you are ever exposed to the disease-causing germ in the future, your immune system will be able to quickly destroy it before it has a chance to make you sick. This is how you get immunity from vaccines.