“This phase is called Phase 3 efficacy testing, and it is designed to see if the vaccine actually prevents disease. Up to 30,000 volunteers will be assigned to one of two groups. One group will receive two injections spaced approximately 28 days apart of mRNA-1273, as the vaccine is known. The other group will receive an injection containing only salt water.” Moderna’s Covid-19 Vaccine Candidate Heads To Widespread Testing In US.

+ “Making a vaccine quickly is hard enough but distributing one worldwide offers a host of other variables, and conflicting forces may work against the effort: The infrastructure powering the global economy is scaling down for a protracted downturn just as pharmaceutical companies need to scale up for the biggest and most consequential product launch in modern history.” The World’s Supply Chain Isn’t Ready for a Covid-19 Vaccine. (It would be ironic if world governments commandeered cruise ships to deliver the vaccine…)