It's the most contagious coronavirus mutant so far in the pandemic, but COVID-19 vaccines still provide strong protection against it. Nearly all hospitalizations and deaths are among the unvaccinated. Here's what to know about the delta variant.
It's the most contagious coronavirus mutant so far in the pandemic, but COVID-19 vaccines still provide strong protection against it. Nearly all hospitalizations and deaths are among the unvaccinated.
Some breakthrough cases with mild or no symptoms were always expected, since the vaccines were designed to prevent serious illness. The CDC no longer publicly counts those milder breakthrough cases, but a Kaiser Family Foundation analysis of data from states that keep a tally found they make up a tiny share of all COVID-19 infections.
The delta, first detected in India, has quickly become dominant wherever it has landed, including the U.S.
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