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Delta variant becomes dominant Covid strain in the U.S.

02:50

The highly contagious delta Covid-19 variant has become the dominant strain the in the U.S., making up for more than half of new cases across the country. Director of the Institute for Autoimmune and Rheumatic Diseases at St. Joseph Health, Dr. Bob Lahita, joins News NOW to explain how the delta variant differs from the original strain and whether other variants could emerge as cases increase.