What does “vaccine efficacy” mean?

With the third Covid-19 vaccine approved by the FDA, there has been a great of talk comparing “vaccine efficacy” rates. You may be trying to figure out what all of this means? What is “vaccine efficacy” and can we use it to compare the different vaccines? Well, this NY Times article “What Do Vaccine Efficacy Numbers Actually Mean?”really helps. Ihttps://www.nytimes.com/interactive/2021/03/03/science/vaccine-efficacy-coronavirus.html?smid=url-sharet offers some clear explanations.

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