Preston Henson was a toddler when his parents realized his illness on a family vacation was more than a run-of-the-mill virus. It was E. coli food poisoning that quickly worsened into a disease that began destroying his kidneys. Doctors diagnosed Preston with hemolytic uremic syndrome — known as HUS. Without a kidney transplant, doctors said Preston would need to undergo dialysis for a lifetime. His dad, Gerald, made the decision to donate one of his kidneys, and the transplant was successful. Preston is now a healthy 4-year-old who takes two medications a day and is as active as any preschooler. In this "Tell Me a Story," listen to the Hensons talk about how the decision changed their lives.