COVID-19 Vaccine in Saudi

A paragraph
That includes.
1- the emergence of covid-19 vaccine and it’s composition ( example: mRNA and how does it work on the cellular level)
2- When the government of Saudi Arabia started to provide these vaccines to the citizens

Please note:please make sure that there is no plagiarized writing and the references needs to be from scientific and proven studies(articles)

For more information on COVID-19 Vaccine in Saudi read this:https://en.wikipedia.org/wiki/COVID-19_vaccine