If a person receives the first dose of a 2-dose vaccine, this metric goes up by 1.
The Moderna vaccine is genuinely very promising so far: In early data from the phase 3 trial, the vaccine had an efficacy of 94.
The precise timing of these studies mattered a great deal in practice.
But countries like Spain and Italy are only vaccinating kids 12 years old and up right now.
Global Commission for Post-Pandemic Policy.
In early stages of the pandemic, it was not known if it would be possible to create a safe, reliable and affordable vaccine for this virus, and it was not known exactly how much the vaccine development could cost.