In May, fully vaccinated people accounted for 9% of all hospitalizations according to the document, which the presentation says reflects "increases in vaccine coverage" that are higher "in older adults.".The agency cites data — expected to be released on Friday — from a July 4th outbreak of cases among residents and visitors to Provincetown, Massachusetts, showing the amount virus in samples collected from vaccinated and unvaccinated cases were virtually identical.
That echoes previous reports from India, which the agency cites in the presentation, suggesting vaccine breakthrough cases with the delta variant could be far more transmissible than with previous mutant strains, spreading even as much as in some unvaccinated cases.The research on the July 4th outbreak prompted federal health officials to urge even fully vaccinated Americans to wear masks indoors in areas of "substantial" or "high" spread of the virus, urge all people in schools to wear masks this fall, and revise its earlier guidance exempting many fully vaccinated people from COVID-19 testing recommendations.Briefing reporters earlier this week about the shift in the agency's guidance, Walensky acknowledged that their science on the risk fully vaccinated people had of spreading the virus to others — in the rare cases they had a "breakthrough" infection — had shifted
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