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Wafaa El-Sadr, MD, MPH, MPA explains how the increase in COVID-19 cases related to the Delta variant poses risks for unvaccinated populations.

“What we know for sure about the delta variant is it is highly transmissible, which means someone who is unvaccinated is at very high risk, is extremely vulnerable, if they come in contact with someone with delta,” said Dr. Wafaa El-Sadr, a professor of epidemiology and medicine at the Mailman School of Public Health at Columbia University.

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