What is Disease X? Dr. Amesh Adalja and Dr. Anita Cicero of the Center for Health Security return to the podcast to talk with Dr. Josh Sharfstein about the unknown cause of the next pandemic, which is likely to come from a viral family already known but poorly studied. They talk about how investing now to develop medical countermeasures like diagnostic tests and treatments could buy valuable time and save many lives when the next threat emerges.