This was because the US health official factored in the whole fully vaccinated population against the breakthrough cases without considering the fact that the majority of the population were not exposed to the virus. This would skew the assessment and give the wrong conclusion.
Therefore, the US health official concluded that the vaccination was 96% effective in preventing illnesses which might not be true.
In Singapore, we're getting at least a few daily breakthrough cases which are showing that the breakthrough cases are not as rare as proclaimed to be.
How can it be rare when it is a daily occurrence?
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