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Medical Definition of Vaccination. Vaccination: Injection of a killed microbe in order to stimulate the immune system against the microbe, thereby preventing disease. … To immunize against viral diseases, the virus used in the vaccine has been weakened or killed.
Vitamins are organic substances needed in small quantities for the optimal metabolism of the body. Vitamins are divided into water soluble and fat soluble vitamins.
Water soluble vitamins include vitamin A and C
Fat soluble vitamins include Vitamin A,D,E and K