There was a trial running in the UK testing giving differing doses of vaccine [1], although I've not seen any results from it. [1] - https://www.bbc.co.uk/news

There was a trial running in the UK testing giving differing doses of vaccine [1], although I've not seen any results from it. [1] - https://www.bbc.co.uk/news/health-55924433 https://www.bbc.co.uk/news/health-55924433