Is Your Vaccine Safe?

For a phase three trial to be effective, you need to compare a control group with the vaccine group and show that there's just a very material difference in the number of people affected. The key goal is to measure how well the vaxine works, how effective it is. So we deliberately set up two other trials, one in brazil and one in south africa, to increase the chance that over all, we would have enough cases for a result by quarter three of last year. And i was certain of the view that one should be optimist tick and not aim for a hundred and 50 cases. Aimed for maybe a first luxe at 30 cases, and then a second

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