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Primary Immune Response

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Vaccines are made from microorganisms and they are given to a person to produce reduced sensitivity or increased immunity to an infectious disease. can be protected or made susceptible to a disease. Vaccines contain organisms that have been killed or weakened. They prepare the body to fight disease without exposing it to disease symptoms.

When foreign invaders such as bacteria or viruses enter the body, immune cells called lymphocytes respond by producing antibodies, which are protein molecules. These antibodies fight the invaders known as an antigen and protect against further infection. A primary immune response happens the first time a person is exposed to an antigen. This response is slow and takes several weeks to occur, memory cells

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