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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?
How many times did you fall ill in the last one year? What were the illnesses?
(a) Think of one change you could make in your habits in order to avoid any of /most of the above illnesses.
(b) Think of one change you would wish for in your surroundings in order to avoid any of/most of the above illnesses.
Conduct a survey in your neighbourhood to find out what the three most common diseases are. Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases.
Under which of the following conditions is a person most likely to fall sick?
(a) when she is recovering from malaria.
(b) when she has recovered from malaria and is taking care of someone suffering from chicken-pox.
(c) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
Why?
Explain the methods of prevention of malaria.
"Prevention is better than cure". Explain.
Explain the general ways of preventing infection.
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?
