About 57% of Americans ages 12 and up have been fully vaccinated against COVID-19, according to the CDC, but a small percentage of those people are still testing positive for the virus. We asked Dr. Reynold Panettieri, professor of medicine and pulmonary physician at Rutgers University’s Robert Wood Johnson Medical School, about the likelihood of getting a breakthrough infection and the latest information on the highly contagious Delta variant. To read the full interview.