What does this mean for unvaccinated people?

Infections that are novel. Transmission has been increased. Recommendations and regulations for new masks. The Delta variety is fuelling COVID-19 outbreaks across the United States, increasing concerns about the pandemic's future.

The extremely contagious Delta variation was discovered in March in India, and it now accounts for more than 93 percent of all sequenced coronavirus infections in the country.

The Centers for Disease Control and Prevention suggested this week that fully vaccinated people in high transmission areas return to masks in public indoor places, noting evidence that the Delta variant can cause high virus loads in the nostrils and throats of even completely vaccinated people.

While scientists agree that the vaccines continue to provide effective protection against Delta variant infection, particularly against severe disease and death, doubts persist. We're only now learning how the new version spreads so quickly if it causes more serious illness, and why there are more breakthrough infections as Delta expands.

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