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प्रश्न
Explain how does vaccine work?
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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 is immunisation?
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?
A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself.
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.
A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick?
(b) what is the sickness?
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?
