NEW: CDC issues warning about delta variant of Covid-19: "Acknowledge the war has changed." on.msnbc.com/3lcx2y5
An internal CDC document concludes that the delta variant is “highly contagious, likely to be more severe” and that “breakthrough infections may be as transmissible as unvaccinated cases.”
Vaccines continue to be effective, particularly at preventing severe disease, according to the document. But they may not be as good at preventing infection or transmission of the delta variant.
That’s a change from previous variants. The vaccines were very effective at preventing transmission of the alpha variant, which was the dominant strain in the country earlier this year when the CDC first said vaccinated people do not need to wear masks.
The CDC presentation was "insightful & largely reassuring," said Dr. Ashish Jha, dean of the Brown Univ. School of Public Health, emphasizing that the data shows that vaccines continue to prevent most infections and almost all hospitalizations.
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