Vaccines help to boost the natural immune system, protecting us from some of the viruses and bacteria that can cause diseases. Understanding the immune system is essential to understanding how they do this.
For information on some of the scientific terms mentioned in the video, check out our glossary.
How are vaccines developed?
By studying the immune system, scientists have developed vaccines that prepare the body to protect itself against viruses and bacteria. New vaccines are rigorously tested before they are recommended by independent experts.
Find out how vaccines are tested to ensure they are safe and effective in this short animation.