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For information on this - you may fine the follwing sites useful:
https://edition.cnn.com/2020/11/24/health/covid-vaccines-design-explained/index.html
https://newseu.cgtn.com/news/2020-12-31/What-are-the-differences-between-the-COVID-19-vaccines--WEq6ZrU9lS/index.html
https://www.medicalnewstoday.com/articles/how-do-covid-19-vaccines-compare-with-other-existing-vaccines
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