This is what that press release was based on:
The announcement by the two companies came after their test found 94 confirmed cases of Covid-19, the vast majority of which belonged to the control group of volunteers who had been given a placebo vaccine. The companies did not say exactly how many of the 94 infected had been vaccinated and how many the placebo, but estimated that - based on the distribution between the two groups (vaccinated and control) - the vaccine was more than 90% effective.
You tell me what this ....means,
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