Study: Mutation found that makes Delta variant more deadly

A certain mutation in the COVID-19 Delta variant causes infected cells to form disruptive chunks in the lungs and leads to ...
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'The war has changed' - CDC warns of delta variant's extreme contagiousness, severity

The delta coronavirus variant surging across the United States appears to cause more severe illness and spread as easily as chickenpox, according to an internal document from the US Centers for ...