Wafaa El-Sadr, MD, MPH, MPA explains why there should be concern over an increase in the number of COVID-19 cases caused by the delta variant.

“Because [delta] has an advantage in terms of transmissibility, it takes over,” said Dr. Wafaa El-Sadr, director of ICAP at Columbia University and professor of epidemiology and medicine at Columbia Mailman School of Public Health in New York City. “It’s just a matter of time.”

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