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“While all of those technologies are nifty and cool to see, they’re not the safest,” said Ana H. Kim, a neurotologist and professor of otolaryngology at Columbia University.

Dr. John van Bockxmeer, a primary care physician and an assistant professor of medicine at Columbia University, has noticed an influx of messages from patients with runny noses, chills, and coughing.

Editor's Note: David Ho, interviewed for this Opinion Video, is the Clyde '56 and Helen Wu Professor of Medicine and the director of the Aaron Diamond AIDS Research Center at Columbia University.