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How immunization works?

The Immune response is a natural mechanism activated by the human body when it detects the presence of an infectious agent.
Among our immune system’s most important features is its ability to distinguish cells and molecules that belong to the body from those that don’t. Its role is to stop a pathogenic agent (a virus, bacteria, or parasite, etc.) from spreading inside our bodies. Once an infectious agent is recognized, the immune system responds to the invasion by producing antibodies and competent cells in adequate quantities, targeting specifically the infection or the disease 1.

How immunization works - Animation

Reference

  1. CDC. Understanding How Vaccines Work. Last Reviewed February 2013. Accessed January 2018. Retrieved from: https://www.cdc.gov/vaccines/hcp/conversations/downloads/vacsafe-understand-color-office.pdf

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