By the end of September, Moderna's two dose COVID-19 vaccine, measured as 89% effective in March, is only 58 % effective.
The effectiveness of shots made by Pfizer and BioNTech vaccine, which also employed two doses, fell from 87% to 45% In the same period.
And most strikingly, the protective power of Johnson & Johnson single dose vaccine plunged from 86% to just 13% over those six months.
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