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A highly contagious form of the coronavirus known as the Delta variant is spreading rapidly and becoming increasingly prevalent around the world. First identified in India in December, Delta has now been identified in 111 countries.

In the United States, the variant now accounts for 83% of sequenced COVID-19 cases, said Rochelle Walensky, director of the Centers for Disease Control and Prevention, at a July 20 Senate hearing. In May, Delta was responsible for just 3% of U.S. cases. The World Health Organization projects that Delta will become the dominant variant globally over the coming months.

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Emily Mullin
Emily Mullin is the acting editor of Leaps.org. Most recently, she was a staff writer covering biotechnology at OneZero, Medium's tech and science publication. Before that, she was the associate editor for biomedicine at MIT Technology Review. Her stories have also appeared in The Washington Post, New York Times, Wall Street Journal, Scientific American, National Geographic and Smithsonian Magazine.
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"Making Sense of Science" is a monthly podcast that features interviews with leading medical and scientific experts about the latest developments and the big ethical and societal questions they raise. This episode is hosted by science and biotech journalist Emily Mullin, summer editor of the award-winning science outlet Leaps.org.
Emily Mullin
Emily Mullin is the acting editor of Leaps.org. Most recently, she was a staff writer covering biotechnology at OneZero, Medium's tech and science publication. Before that, she was the associate editor for biomedicine at MIT Technology Review. Her stories have also appeared in The Washington Post, New York Times, Wall Street Journal, Scientific American, National Geographic and Smithsonian Magazine.
Virus image by Fusion Medical Animation on Unsplash

"Making Sense of Science" is a monthly podcast that features interviews with leading medical and scientific experts about the latest developments and the big ethical and societal questions they raise. This episode is hosted by science and biotech journalist Emily Mullin, summer editor of the award-winning science outlet Leaps.org.

Hear the episode:

Emily Mullin
Emily Mullin is the acting editor of Leaps.org. Most recently, she was a staff writer covering biotechnology at OneZero, Medium's tech and science publication. Before that, she was the associate editor for biomedicine at MIT Technology Review. Her stories have also appeared in The Washington Post, New York Times, Wall Street Journal, Scientific American, National Geographic and Smithsonian Magazine.