Author: Freesciencelessons via YouTube
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In this video, we look at vaccination and herd immunity. First we explore how vaccines trigger an immune response and the different types of vaccines that are used. We then explore herd immunity and why this can break down. Finally, we look at why some infectious diseases are difficult to vaccinate against.

Image credits:

COVID vaccination
https://commons.wikimedia.org/wiki/File:COVID_Vaccine_(50745583447).jpg
Chairman of the Joint Chiefs of Staff from Washington D.C, United States, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons

New Zealand Measles Epidemic
https://commons.wikimedia.org/wiki/File:2019%E2%80%932020_Measles_Outbreak_Cases_in_New_Zealand_(DHB_Totals).svg
Base map: Base map: Stats NZ, edits by Air55Colourisation: multiple authors, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

COVID map
https://commons.wikimedia.org/wiki/File:World_map_of_total_confirmed_COVID-19_cases_per_million_people.png
Our World In Data, CC BY 4.0 https://creativecommons.org/licenses/by/4.0, via Wikimedia Commons

Oral Polio Vaccine
https://commons.wikimedia.org/wiki/File:Oral_Polio_Vaccine.jpg
Centers for Disease Control and Prevention, Public domain, via Wikimedia Commons

Boostrix IPV
https://commons.wikimedia.org/wiki/File:Boostrix-IPV_vaccine.jpg
Whispyhistory, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Influenza virus
https://commons.wikimedia.org/wiki/File:Influenza_virus.png
This image is a work of the National Institutes of Health, part of the United States Department of Health and Human Services, taken or made as part of an employee’s official duties. As a work of the U.S. federal government, the image is in the public domain.

Common cold virus
https://commons.wikimedia.org/wiki/File:Rhinovirus_isosurface.png
Thomas Splettstoesser (www.scistyle.com), CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

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