In the Covid-19 vaccine race two shots are better than one. That was the USA’s theory as the CDC stockpiled second shot doses. The UK’s strategy was to distribute all the supply of covid-19 vaccines and get as many single-doses into arms knowing there would be a deficit when the second shot dates rolled around. Single shots are much better than none strategy.
The UK now has 47% of their population with at least one shot while the USA lags behind at 36%. That time difference created very different outcomes.
The UK now sits at an enviable 24 new cases per million while the USA that had been able to drop below 200 now has risen to around 210. That early widespread vaccination in the UK drops the infection rate much quicker and steeper than in the USA. Two shots are marginally better than one, one shot of the covid-19 vaccine is vastly better than none.