The public health people only gave “emergency” approval. While they found the vaccine safe and reasonably effective at reducing the chance of becoming seriously ill from Covid19, they would need much more time to determine if it prevent someone from spreading the disease. Working in favor of relaxed rules is that 90% of the people who get the disease don’t become seriously ill (the placebo vaccine would have been 90% effective, so when the talk about the effectiveness of the vaccine they are comparing it to the placebo and looking for how many people become seriously ill after getting the vaccine, as opposed to those who got the placebo).
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