WASHINGTON: The Delta variant of the coronavirus is as contagious as chickenpox, probably causes more severe disease than past strains, and breakthrough cases in vaccinated individuals may be as transmissible as unvaccinated cases, according to a leaked US government document.
One of the biggest takeaways is the finding that breakthrough infections in vaccinated people are highly contagious, with the data coming from previous studies and aExperts rely on a number called the cycle threshold value to indicate how much virus an infected person harbours, with lower numbers indicating higher viral load.In Provincetown, there was"no difference in mean Ct values in vaccinated and unvaccinated cases," the slides said.
"This is a key point which is part of the reason the CDC changed its guidance," Celine Gounder, an infectious diseases physician and professor at New York University, told AFP. A review of findings from other countries shows that while the original SARS-CoV-2 was as contagious as the common cold, each person with Delta infects on average eight others, making it as transmissible as chickenpox but still less than measles.
Vaccine efficacy estimates vary across countries, but in its concluding slide, the CDC estimates the risk of severe disease or death is reduced 10-fold or greater in the vaccinated, while risk of infection is reduced three-fold or greater.
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