Five takeaways on the science behind the CDC's latest mask guidance
With surges in Covid-19 cases driven by the Delta variant, most Americans are now being advised to wear masks indoors -- regardless of vaccination status -- by the US Centers for Disease Control and Prevention.
Since CDC guidelines updated Tuesday, we have learned more about the science that motivated these changes, both from a leaked agency document and a study published Friday by the agency. The new research reinforces the ongoing need for everyone who can get vaccinated to get vaccinated. Here are five key takeaways:Delta is super transmissibleWe knew Delta was spreading fast.
In a population that's 60% fully vaccinated with an 80%-effective vaccine, you'd expect nearly a quarter of infections to be breakthroughs. If you change either number to 70%, breakthroughs might approach nearly a third of infections.This, of course, assumes everyone in a population is the same.
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