Since the emergence of COVID-19, much remains unknown, including the widespread organ damage beyond just the lungs. Increasingly, scientists are learning organ dysfunction results from damage to the blood vessels, but why is unclear. Now a team has discovered what they believe is the key molecular pathway. Results show COVID-19 damages the cells lining the smallest blood vessels, choking off blood flow. "We were surprised by the little overlap between our adult and pediatric patients," says Cheryl Maier, MD, Ph.D. "One pathway that stood out in adults was related to vessel health and blood flow." Maier says this was particularly...