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Why do we need multiple doses of a vaccine?

On this page, you will find a short animation accessible for all to explain why we need multiple doses of a vaccine and how immune memory is boosted by a second dose. It's important that everyone receives two doses of the COVID-19 vaccine to provide the best, longer-lasting protection against COVID-19. Share the animation on social media tagging @britsocimm to help strengthen public understanding.

The British Society for Immunology has partnered with the Centre for Inflammation Research at the University of Edinburgh to create this animation. 

Knowledge of COVID-19 vaccinations will continue to evolve and this videos is accurate at the time of publishing in February 2021. 


Want to learn more? Watch our three-part animated series on the human immune system and how immune memories forms in response to infections like coronavirus.

Other common questions and concerns about COVID-19 vaccines are answered in our free, easy-to-read guide.

A guide to vaccinations for COVID-19