(i) Vaccines is a product in the form of weakened or inactivated pathogens or proteins which are used to provide protection against a disease which may infect in future and can be fatal. It stimulates the production of antibodies by the body against that particular disease. The diseases for which vaccines are available in the market are: (ii) (a) Polio, (b) Hepatitis, (c) Measles, (d) Small-pox, (e) Diphtheria, (J) Tetanus, (g) Whooping cough, etc.