Question

what is vaccination? give examples of vaccines

Answer 1

A vaccine is a biological preparation that provides active acquired immunity toa particular disease. A vaccine typically contains an agent that resembles a disease-causing micro-organism and is often madefrom weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and keep a record of it, so that the immune system can more easily recognize and destroy any of these micro-organisms that it later encounters. Vaccines can beprophylactic (example: to prevent or ameliorate the effects of a future infectionby any natural or "wild" pathogen), or therapeutic.

Answer 2

It is the artificial introduction of weakened or dead pathogenic organisms into the body to stimulate the production of antibodies and the development of immunity to the particular disease..
Examples :- BCG vaccine for Tuberculosis
                    Salk's vaccine for poliomyelitis

Hope it helps..
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