Why Some Countries Are Delaying COVID Booster Shots

Some countries are planning to wait up to 12 weeks to administer second doses of COVID-19 vaccines. Will this slow the virus?

CoVID-19 News & Updates playlist: https://www.youtube.com/playlist?list=PLsNB4peY6C6IQediwz2GzMTNvm_dMzr47

Hosted by: Hank Green

SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org
----------
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:

Silas Emrys, Jb Taishoff, Bd_Tmprd, Harrison Mills, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, charles george, Alex Hackman, Chris Peters, Kevin Bealer
----------
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
----------

Read more about the ethics of altered vaccine schedules:
https://blog.petrieflom.law.harvard.edu/2021/01/06/covid-vaccine-one-dose-two/
https://www.cdc.gov/mmwr/volumes/69/wr/mm6947e3.htm#contribAff

Sources:
https://www.sciencemag.org/news/2021/01/could-too-much-time-between-doses-drive-coronavirus-outwit-vaccines
https://www.cdc.gov/vaccines/hcp/conversations/downloads/vacsafe-understand-color-office.pdf
https://www.bmj.com/content/372/bmj.n18
https://news.ncsu.edu/2021/01/one-dose-or-two/
https://www.bbc.com/future/article/20210114-covid-19-how-effective-is-a-single-vaccine-dose
https://www.immunology.org/policy-and-public-affairs/briefings-and-position-statements/COVID-19-vaccine-dosing-schedules https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)32661-1/fulltext
https://www.nejm.org/doi/10.1056/NEJMoa2034577
https://www.reuters.com/article/us-health-coronavirus-germany-biontech/biontech-says-no-data-to-support-delayed-vaccine-booster-shot-idUSKBN2991XX
https://blogs.bmj.com/bmj/2021/01/05/covid-19-vaccines-to-delay-or-not-to-delay-second-doses/
https://www.theguardian.com/world/2021/jan/04/germany-denmark-second-dose-covid-vaccine
https://www.fda.gov/news-events/press-announcements/fda-statement-following-authorized-dosing-schedules-covid-19-vaccines