Q)What is vaccination? How does it protect us from infections? Name any four diseases that are prevented by vaccination.
Ans)The w.b.cs produce anti-bodies which neutralize the toxins by the invaders. The w.b.cs are of different kinds and each kind consists of millions of cells which recognize and combat a specific foreign invader. Once a class of WBC's has encountered a particular kind of invader, it develops memory and is trained to ward off future attacks. In this way the body becomes immune to that infection and that process is called immunization.
Our body regularly develops natural immunity as a variety of fighting cells are produced by actual attacks of infectious agents.Artificial immunization is a clever idea. It is done by vaccination that is by artificial introduction into the body of a weak infection, which triggers a defense mechanism and produces wbc's trained to combat that particular infection.
Tetanus, hepatitis-b,polio and measles are the four diseases that can be prevented by vaccination.
Ans)The w.b.cs produce anti-bodies which neutralize the toxins by the invaders. The w.b.cs are of different kinds and each kind consists of millions of cells which recognize and combat a specific foreign invader. Once a class of WBC's has encountered a particular kind of invader, it develops memory and is trained to ward off future attacks. In this way the body becomes immune to that infection and that process is called immunization.
Our body regularly develops natural immunity as a variety of fighting cells are produced by actual attacks of infectious agents.Artificial immunization is a clever idea. It is done by vaccination that is by artificial introduction into the body of a weak infection, which triggers a defense mechanism and produces wbc's trained to combat that particular infection.
Tetanus, hepatitis-b,polio and measles are the four diseases that can be prevented by vaccination.
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