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Earlier research suggests that for every documented, confirmed case, seven or more people are infected but not diagnosed, said Jeffrey Shaman, a Columbia University scientist.

Editor's Note: Craig Spencer, an assistant professor of emergency medicine and population and family health, helps viewers understand the role they can play in slowing the spread of the coronavirus.

Dr. Nancy Wexler spent the last 40 years researching Huntington’s disease, venturing to remote parts of Venezuela to study large extended families with high rates of the disease.