what are vaccines ? how do they work
Answers
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.
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.
Answer:
Vaccine is a suspension of killed or attenuated microbes, or a substance that mimics the disease-causing microbes. It acts by stimulating an immune response of the body which can prevent the infection or create resistance to an infection.
For example: If a child has suffered from small pox once, then there is almost no chance of him suffering from it again. This happens because when the immune system of the body encounters a virus for the first time, it reacts against it and remembers it.
For instance, when small pox virus attacks the body for a second time, the immune system reacts strongly to prevent chances of suffering from the disease again. Therefore, it can be concluded that if we infect the body of a person with something that mimics the microbe, then the immune system will remember it, and prevent the actual disease-causing microbe from causing any disease. Thus how a vaccine works.
Explanation: