What a vaccine’s “effectiveness rate” in fact indicates.
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In the United States, the very first 2 readily available Covid-19 vaccines were the ones from Pfizer/BioNTech and Moderna. Both vaccines have extremely high “effectiveness rates,” of around 95%. The 3rd vaccine presented in the United States, from Johnson & Johnson, has a significantly lower effectiveness rate: simply 66%.
Take a look at those numbers beside each other, and it’s natural to conclude that a person of them is significantly even worse. Why choose 66% when you can have 95%? That isn’t the ideal method to comprehend a vaccine’s effectiveness rate, or even to comprehend what a vaccine does. And public health professionals state that if you truly need to know which vaccine is the very best one, effectiveness isn’t in fact the most crucial number at all.
Additional reading from Vox:
Why comparing Covid-19 vaccine effectiveness numbers can be deceptive: https://www.vox.com/22311625/covid-19-vaccine-efficacy-johnson-moderna-pfizer
The vaccine metric that matters more than effectiveness: https://www.vox.com/22273502/covid-vaccines-pfizer-moderna-johnson-astrazeneca-efficacy-deaths
The limitations of what vaccine effectiveness numbers can inform us: https://www.vox.com/21575420/oxford-moderna-pfizer-covid-19-vaccine-trial-biontech-astrazeneca-results
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