Danielle Mitchell, Rodney Chiles, Brooklynn Chiles

Family photos of Danielle Mitchell and Rodney Chiles and their daughter, Brooklynn Chiles, decorate the kitchen refrigerator in Washington, Wednesday, Feb. 9, 2022. Rodney died of COVID-19 last year and Brooklyn has tested positive three times. Brooklynn is part of a NIH-funded multi-year study at Children's National Hospital to look at impacts of COVID-19 on children's physical health and quality of life. (AP Photo/Carolyn Kaster)