what is vaccine answer in brief
Answers
Answer:
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Explanation:
Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results. The effectiveness of vaccination has been widely studied and verified.[1][2][3] Vaccination is the most effective method of preventing infectious diseases;[4] widespread immunity due to vaccination is largely responsible for the worldwide eradication of smallpox and the elimination of diseases such as polio and tetanus from much of the world.
Answer:
a vaccine is a special kind of preparation ( or medicine) which provides immunity ( or protection) against a particular disease . vaccine are given to a healthy person so that they may not get a certain disease throughout their life
a vaccine work as follow:
a vaccine contain the dead or weakened but alive microorganisms of a disease ( which are harmless and do not actually give a disease ) . When the vaccine containig dead or alive microorganisms is introduce into the body of a healthy person orally ( by mouth ) or by injection ,the body of that person respond by producing some substance called antibodies in it's blood .these antibodies kills the alive disease causing microorganisms present in the vaccine .some of the antibodies remain in the blood of the person for a long time and fight against the same microorganisms and kill them if they happen to enter the body naturally at a later date. so due to this