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We would start by vaccinating about 100,000 individuals in the first step. We would look at the hospitalization rates once we've done those vaccinations. And if we find that the hospitalization rates are below the threshold -- that we are looking at -- then we can be confident that the vaccine is efficacious... and if so, we can then proceed to continuing the rollout, if we find that the hospitalizations are substantial -- more than we anticipated -- then we would have to stop, take stock of where we are and perhaps switch to other vaccines.