Dr. Thomas McGinn answers viewers' questions about vaccines and side effects

There's a race to find a COVID-19 vaccine. What are vaccine developers working on? How will those vaccines work? And when could it be ready?
Dr. Thomas McGinn, the director of Health Innovations & Outcomes Research at Feinstein Institutes, joined News 12's Elizabeth Hashagen to answer viewers' questions about COVID-19 vaccines.
Dr. McGinn says that in each phase of vaccine trials, doctors continue broadening the number of people getting the vaccine to see if they continue to get the immunity doctors are looking for with minimal side effects.