Micro-organisms friend and foe — Science STD 8 — Question
Maharashtra BoardEnglish MediumSTD 8ScienceMicro-organisms friend and foe5 Marks
Question
What is a vaccine? How does a vaccine work?
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Answer
A vaccine is a special kind of preparation which provides immunity against a particular disease. Vaccine consists dead and weakened microbes which are harmless and do not cause any disease.Vaccine works as follows:
When the vaccine containing dead or weakened microbes is introduced into the body of a healthy person, the body fights and kills the microbes by producing some substance called antibodies.
Some of the antibodies remain in the body for a long time and protect it from any future attack of disease germs. Thus, a vaccine develops the immunity from a disease.
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