Has any teenager wondered why they are given injections since birth. Every teen must have got around 5-6 doses of injection which they hate. Why is everyone given such terrible injections? What is the reason behind prolongivity of life seen these days? The main reason is hidden beneath those doses of injection which we get. It is these injections which save us from the millions of diseases prevailing in this world.

Vaccines are produced by using killed organisms which cause infection and injecting the vaccine into the body in order to avoid various diseases is the process known as vaccination . We can take any part of the organism which is the main cause of the disease and destroy its ability to cause infection. These killed pathogens (which cause diseases) can elicit formation of antibodies (substances which are produced to fight against the foreign substances which cause diseases). Formation of antibodies against the pathogen which has lost its ability to cause infection is the key to prevent the diseases.

Scientists have developed vaccines for various diseases such as polio, diphtheria, tetanus, chicken pox, small pox, tuberculosis, measles, malaria etc.

By using vaccines it is possible to eradicate diseases completely. For example vaccination against small pox has helped in eliminating that disease from this world.