Raju of Class IX was suffering from chickenpox. His friends Priya and Shaurya wanted to visit him. Shaurya’s parents did not allow him to go. Priya already had suffered from it few months before. Priya’s parents allowed her to visit him. What could be the reason behind their parents’ decision? What is the basis of principle of immunisation ?
Q. Raju of Class IX was suffering from chickenpox. His friends Priya and Shaurya wanted to visit him. Shaurya’s parents did not allow him to go. Priya already had suffered from it few months before. Priya’s parents allowed her to visit him. What could be the reason behind their parents’ decision? What is the basis of principle of immunisation ?
Ans. As Priya had already suffered from chickenpox few months back, her body has become immune to chickenpox-causing microbe. So, if that microbe enters her body again, her body would fight that microbe. Hence, her parents allowed her to visit Raju.
On the other hand, as Shaurya has never suffered from chickenpox, his body is not immune to chickenpox. Hence, his parents refused him to visit Raju.
Basis of principle of immunisation : It involves stimulating the host to develop immunity against agent that causes disease. This is done by introducing weak microbes of that disease. Once the body starts making antibodies it can fight against the disease and body becomes immune against the disease.
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