L2.7.3: Definition of Terms

• Vaccine

  Biological preparation that improves immunity to a particular disease.

  ● It has an agent that resembles the disease-causing microorganism that is made from weakened or killed forms of its microbe (antigens).
• How do Vaccines Work?

  1. Recognizes invading germ

  2. Produces antibodies (In the presence of an antigen)

  ○ Proteins produced by immune system in order to fight disease

  ○ Specificity = The binding of the antigen and antibody are based on its receptors.

  3. Remembers disease and how to fight it

  ○ If exposed to the germ in the future, the immune system can destroy it before you become unwell. (Immunity lasts for several years)
• Memory Cells - Cells in the immune system that recognizes the microorganism or agent.
• Vaccination

  A simple, safe, and effective way of protecting people against harmful diseases.

  ● Uses body’s natural defense to build resistance to specific infections and makes your immune system stronger

  ● Don’t cause the disease or put you at risk of its complications