A living organism such as the body has the power itself to resist and overcome infections. This is known as immunity. The body has to be helped to acquire this immunity. In this case of many diseases produced by viruses, immunity is created by a person's having the disease and recovering from it. As an example chicken pox give the body a lasting immunity, means once someone have this disease, he won't get that again.
To produce immunity artificially, a virus can be injected that has been weakened. The person thus gets a slight case of the disease. When he recovers, he remains immune for various lengths of time. The injection of the weakened virus is known as vaccination. A vaccine consists of the disease organisms which have been made harmless and produce immunity by causing the formation of antibodies. Antibodies neutralized the viruses and are produced by the body itself. The vaccine fuels the body to produce them.
To produce immunity artificially, a virus can be injected that has been weakened. The person thus gets a slight case of the disease. When he recovers, he remains immune for various lengths of time. The injection of the weakened virus is known as vaccination. A vaccine consists of the disease organisms which have been made harmless and produce immunity by causing the formation of antibodies. Antibodies neutralized the viruses and are produced by the body itself. The vaccine fuels the body to produce them.
