Delta poses a bigger threat than earlier strains for people spending significant time indoors with other people who are infected, scientists warn. Here's what you need to know.
The Delta variant of the virus that causes Covid-19 is often described as highly transmissible. So, what does that actually mean?means we need to update our thinking about exposure risks. Because people infected with Delta carry higher levels of virus than with earlier strains, the old rules of thumb no longer apply, they say—including the conventional wisdom that it takes 15 minutes of close contact with someone to get infected.
Delta has already changed public-health advice about masking. The Centers for Disease Control and Prevention on Tuesday
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