It accounts for more than 80% of newly diagnosed cases in the US, according to the US Centers for Disease Control and Prevention.
And to compare its transmissibility to past variants would require that kind of testing to have been done in past months -- and that simply was not done.British infectious disease modelers, a group known as the Scientific Pandemic Influenza Group on Modelling, Operational sub-group, say the data indicate the Delta is 40-60% more transmissible than the B.1.1.7 or Alpha variant, which was once the dominant strain in the US but which has been replaced by Delta.
"Available evidence suggests the currently authorized mRNA COVID-19 vaccines are highly effective against hospitalization and death for a variety of strains, including Alpha , Beta , Gamma , and Delta ," the CDC says. Tests done in lab dishes indicate the immune response generated by vaccines should be, in theory, strong and broad enough to cover Delta.
While the CDC originally told people that the vaccinated are less likely to infect others, CDC's Walensky said this week the Delta variant may be different. She's promised to release more data about this soon.The CDC presentation cited three studies that it said showed Delta infections were associated with higher viral load -- meaning people had more virus in their bodies -- and longer duration of shedding, meaning they spread it for longer.
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