A Level Biology Revision "Vaccination and Herd Immunity"

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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