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I guess the point I'm trying to make is that out of 30,000 people in the Moderna Study, you would "expect" 600 to contract the virus without the vaccine in a period of time. If two thirds get the vaccine, then you would expect about 200 to get the virus if it is 100% effective. If it is 50% effective, then you would expect 50% of the 400 given the vaccine to contract the virus, or an additional 200. So, out of 30,000 you "expect" 400 at 50% effectiveness. If only 300 contract the virus, that is 67% effective, which is what Moderna is expecting.
So they are "waiting" for 300 to become infected and will compare the ratios of the placebo to ones given the vaccine. The more effective the vaccine, to longer the 300 will take...
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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