- WHO recommends masks -- even for vaccinated people -- because of delta variant Fox News
- Delta Covid variant may be edging race against vaccines The Guardian
- Crunching the COVID-19 numbers: Even with cases falling, Delta variant starting to spread further in NYC | AMNY
- Opinion | Get Vaccinated. Worry Less About Covid Variants. The New York Times
- How Mutations Have Shaped the Covid-19 Pandemic The Wall Street Journal
- View Full Coverage on Google News
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