How does a vaccine work?
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Answer:
A vaccine is a biological preparation that provides immunity against a particular disease. Vaccines can be used to prevent diseases such as typhoid, hepatitis, cholera, chicken pox, measles, and smallpox. Vaccines are of two types. They may contain dead or weakened microorganisms, what's on administration induce the body to produce substance is called antibodies. Antibodies destroy disease causing microbes and remain in the body to prevent further attack of the same microbe. For example, vaccines for measles and polio. Some vaccine suggest typhoid vaccine contain readymade antibodies instead of weakened pathogens. While the first type can give long term immunity, II type give short term immunity. Administration of vaccine can be oral or injected and the process is called vaccination or immunization.
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.....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.