Avatar - WCVB
WCVB

Dr. Ellerin: 'As the virus spirals out of control, you can expect more variants'

Dr. Todd Ellerin, chief of infectious diseases at South Shore Health, explains how the spread of the virus can lead to mutations and why those mutations could make it more infectious. "It's important to measure and monitor these viruses, so we have to do more genetic sequencing so we know what's actually the dominant strain," he said.