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Vaccine - Why do We Fall ill, Class 9, Science PDF Download

Vaccine : Preparation of weakened infectious agents or their products that can be injected or given orally to prevent specific disease.

 

HISTORY OF VACCINES AND VACCINATION

The modern term vaccination comes from the Latin word vacca means cow and vaccinia

means cowpox An English physician Edward Jenner observed that people who got cow pox (A mild disease) did not suffer from small pox. (a more severe disease). jenner took some pus with a sterile needle from the cowpox rashes of an infected girl and injected in the scratches made in skin of an uninfected boy who soon got cowpox. After he recovered Jenner infected the boys arm with pus from the spots of a person suffering from small pox luckily the boy did not get small pox and jenner experiment was successful.

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FAQs on Vaccine - Why do We Fall ill, Class 9, Science

1. Why do we fall ill?
Ans. We fall ill due to various reasons such as infections caused by bacteria, viruses, fungi, or parasites, lifestyle factors like poor nutrition, lack of exercise, and stress, genetic factors, environmental factors like pollution, and exposure to harmful substances.
2. What is a vaccine?
Ans. A vaccine is a biological preparation that helps to stimulate our immune system and provide immunity against a specific disease. It contains weakened or killed pathogens or parts of pathogens that activate our immune response without causing the actual disease.
3. How do vaccines work?
Ans. Vaccines work by introducing a harmless form of the pathogen, such as a dead or weakened version, into our body. This stimulates our immune system to produce specific antibodies and memory cells that can recognize and respond quickly to the actual pathogen if we are exposed to it in the future. This helps in preventing or reducing the severity of the disease.
4. Are vaccines safe?
Ans. Yes, vaccines are generally safe. They go through rigorous testing and clinical trials to ensure their safety and effectiveness before being approved for use. However, like any medical intervention, vaccines may have some side effects, but they are usually mild and temporary. Serious side effects are extremely rare.
5. What are the benefits of vaccines?
Ans. Vaccines have several benefits. They help prevent the spread of infectious diseases, protect individuals from getting sick or developing severe complications, reduce the burden on healthcare systems, and contribute to the overall public health. Vaccines have been successful in eradicating or significantly reducing the incidence of many deadly diseases worldwide.
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