COVID-19 symptom study app helping researchers better understand virus

BOSTON — Researchers all around the world continue to work 24/7 trying to understand COVID-19 better, from how it spreads to new symptoms.

That includes Dr. Andy Chan, a physician at Mass General and professor of immunology and infectious disease at Harvard T.H. Chan School of Public Health.

Over the last year, he and his colleagues have been dissecting the daily symptoms of some 4.6 million people using the COVID-19 symptom app.