We asked Dr. Mallika Marshall, medical reporter for CBS-affiliate WBZ TV in Boston and an instructor at Harvard Medical School, how we should react when we start to experience a dry cough or perhaps spike a fever. Who do you call? How do you protect your family? When does it make sense to move toward an emergency department, and how should we prepare? Dr. Marshall is the host of Harvard Health Publishing’s online course series, and an urgent care physician at Mass General Hospital.