No, the term "breakthrough" has been used for months and well before the delta variant became an issue. One more time, breakthrough cases were first reported, by definition, with the Pfizer/BioNTech and Modern trials last summer/fall.
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Originally Posted by Velvet
Yes, I guess I was looking more at international data. CDC tends to mostly look at US cases. And I think the term ‘breakthrough’ was used after the Delta variant became significant.
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