write note on vaccine and comment how they protect us ( in detail )
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Answer:
A vaccine is a type of medicine that trains the body’s immune system so that it can fight a disease it has not come into contact with before. Vaccines are designed to prevent disease, rather than treat a disease once you have caught it.
To understand how vaccines work, it helps to look first at how the immune system works, because vaccines harness the natural activity of your immune system. This short animation explains how vaccines enable the body to make the right sort of antibodies to fight a particular disease.
Explanation:
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Answer:
A vaccine is a preparation that improves immunity to a particular disease. It is made from weakened or dead forms of the microbes. When the vaccine containing dead or weak micro-organisms is introduced into the body of a healthy person orally or by injection, the body of that person responds by producing some substances called antibodies in its blood. These antibodies kill the disease-causing micro-organisms present in the vaccine. Some of the antibodies remain in the blood of the person for a very long time and fight against the same micro-organism and kill them if they happen to enter the body again later. So, due to the presence of antibodies in the blood, a person remains protected from that particular disease. Thus, a vaccine develops the immunity from a disease.
Explanation:
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