Understanding the difference between vaccine efficacy and vaccine effectiveness.
Since past couple of weeks, every media channels and sites is bombarded with the news about ongoing vaccine trials. These vaccines may be our key to fight and prevent deadly COVID-19. With the latest update about Pfizer and BioNTech announcing their vaccine (BNT162b2) efficacy rate of 95% (p<0.0001), Moderna announcing efficacy of its vaccine as 94.1% and COVID-19 vaccine developed in the UK by Oxford University and AstraZeneca having 70.4% efficacy, few questions have obviously sparked in the curious minds. What is vaccine efficacy? Is it similar to vaccine effectiveness? And
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