Vaccines are biological preparations made from the weakened or killed forms of microbes. They create immunity against a disease. A Traditional vaccine consists of agents that resemble the disease-causing organism. When these agents enter the human body they stimulate the immune system to recognize these agents as foreign and destroy them. It also makes the immune system remember these foreign agents so that they can recognize and destroy the real live virulent germs. A vaccine can be administered into the body through injections, by mouth or by aerosol.
Depending upon the strategies used to reduce the risk of illness caused by a vaccine, while retaining their ability to induce a beneficial immune response they are classified into various types. The Human vaccines against viruses were made using weaker or attenuated viruses whereas a smallpox vaccine is made of cowpox, a poxvirus similar enough to smallpox virus to create immunity. Several different processes are involved in Vaccine production based on which they are classified into different types.
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