Define vaccination. Name two diseases prevented by vaccination.
Vaccination is the process of immunising an individual against any particular disease by either introducing an antigen or a weak or killed organism into the body of that individual.
Vaccination is the process of administering an antigen into an individual so that the individual is able to fight against specific disease by boosted immune response.
In vaccination the microorganism (or antigen) is given in an inactive form (like heated) so that the body’s immune response produces antibodies against this antigen. The immune system of the body recognizes this antigen and when second time the same pathogen attacks the body a heightened immune response eliminates the pathogen by making the antibodies.
Polio, Diphtheria, tetanus , Pneumonia can be prevented by vaccination.