Understanding How Vaccines and Immunizations Work

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 do not. Its role is to stop a pathogenic agent, such as a virus, bacteria, or parasite, from spreading inside our bodies. Once the immune system recognizes an infectious agent, it responds to the invasion by producing antibodies and competent cells in adequate quantities, targeting the infection or the disease specifically . 1

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  1. CDC. Understanding How Vaccines Work. Last Reviewed August 2018. Accessed November 2021. Retrieved from: https://www.cdc.gov/vaccines/hcp/conversations/understanding-vacc-work.html


This page last update: 11-2021

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