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प्रश्न
Explain how does vaccine work?
उत्तर
A vaccine is a small quantity of a weakened antigen that is injected into the body of an individual. Once the antigen gets into the body of a healthy person, his/her body synthesises antibodies against the antigen. Once the body encounters an infectious antigen, it develops a memory; and when that antigen enters that body again, a large amount of antibodies is secreted by the body to destroy the antigen. Hence, it prevents the disease from occurring.
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संबंधित प्रश्न
What are the immunisation programmes available at the nearest health centre in your locality? Which of these diseases are the major health problems in your area?
Under which of the following conditions are you most likely to fall sick?
(a) when you are taking examinations.
(b) when you have travelled by bus and train for two days.
(c) when your friend is suffering from measles.
Why?
Give an account of occurrence, symptoms, prevention and control of Diarrhoea.
Explain the methods of prevention of malaria.
"Prevention is better than cure". Explain.
Explain the general ways of preventing infection.
What is an antibiotic? Give two examples
Name any two groups of micro-organisms from which antibiotics could be extracted.
Name any three diseases transmitted through vectors.
Why do some children fall ill more frequently than others living in the same locality?
